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diff --git a/docs/dev/_downloads/16d6399e308f3f4937d0512c9c9dd023/plot_psf.pdf b/docs/dev/_downloads/16d6399e308f3f4937d0512c9c9dd023/plot_psf.pdf
diff --git a/docs/dev/_downloads/173b2147fa2a0402fd092316ab70a935/plot_smooth_broken_powerlaw.zip b/docs/dev/_downloads/173b2147fa2a0402fd092316ab70a935/plot_smooth_broken_powerlaw.zip
diff --git a/docs/dev/_downloads/191e39c4584da5619df61ef94dbf1770/plot_spiral_arms.hires.png b/docs/dev/_downloads/191e39c4584da5619df61ef94dbf1770/plot_spiral_arms.hires.png
diff --git a/docs/dev/_downloads/19d9099ed6682c98c1320c3a6a336bc4/plot_template_spectral.py b/docs/dev/_downloads/19d9099ed6682c98c1320c3a6a336bc4/plot_template_spectral.py
@@ -38,10 +38,32 @@
 plt.grid(which="both")
 
 # %%
-# Spectral correction
-# Corrections to templates can be applied by multiplication with a normalized spectral model,
+# Example of extrapolation
+# ------------------------
+# The following shows how to implement extrapolation of a template spectral model:
+
+energy = [0.5, 1, 3, 10, 20] * u.TeV
+values = [40, 30, 20, 10, 1] * u.Unit("TeV-1 s-1 cm-2")
+template_noextrapolate = TemplateSpectralModel(
+    energy=energy,
+    values=values,
+    interp_kwargs={"extrapolate": False},
+)
+template_extrapolate = TemplateSpectralModel(
+    energy=energy, values=values, interp_kwargs={"extrapolate": True}
+)
+energy_bounds = [0.2, 80] * u.TeV
+template_extrapolate.plot(energy_bounds, label="Extrapolated", alpha=0.4, color="blue")
+template_noextrapolate.plot(
+    energy_bounds, label="Not extrapolated", ls="--", color="black"
+)
+plt.legend()
+
+
+# %%
+# Spectral corrections to templates can be applied by multiplication with a normalized spectral model,
 # for example `gammapy.modeling.models.PowerLawNormSpectralModel`.
-# This operation create a new `gammapy.modeling.models.CompoundSpectralModel`
+# This operation creates a new `gammapy.modeling.models.CompoundSpectralModel`
 
 new_model = template * PowerLawNormSpectralModel(norm=2, tilt=0)
 

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diff --git a/docs/dev/_downloads/23a95fa742150b45b73b7f187c1cc8a8/plot_broken_powerlaw.zip b/docs/dev/_downloads/23a95fa742150b45b73b7f187c1cc8a8/plot_broken_powerlaw.zip
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diff --git a/docs/dev/_downloads/432ee3a608125ae95df2e8d950f07716/dl3-1.pdf b/docs/dev/_downloads/432ee3a608125ae95df2e8d950f07716/dl3-1.pdf
diff --git a/docs/dev/_downloads/440149f3931d426b0d9c554d4bb23c5b/light_curve_simulation.zip b/docs/dev/_downloads/440149f3931d426b0d9c554d4bb23c5b/light_curve_simulation.zip
diff --git a/docs/dev/_downloads/440e264b73eac3e4291763a82299dcb1/model_management.zip b/docs/dev/_downloads/440e264b73eac3e4291763a82299dcb1/model_management.zip
diff --git a/docs/dev/_downloads/471a23ea48282aca3ed18c0dab2c428f/plot_shell2.zip b/docs/dev/_downloads/471a23ea48282aca3ed18c0dab2c428f/plot_shell2.zip
diff --git a/docs/dev/_downloads/4722787c7fa105f0833ba203665f472d/maps.zip b/docs/dev/_downloads/4722787c7fa105f0833ba203665f472d/maps.zip
diff --git a/docs/dev/_downloads/486b9bbab34388e381bccada3a10c772/fermi_lat.py b/docs/dev/_downloads/486b9bbab34388e381bccada3a10c772/fermi_lat.py
@@ -273,13 +273,13 @@
 #
 # To load the isotropic diffuse model with Gammapy, use the
 # `~gammapy.modeling.models.TemplateSpectralModel`. We are using
-# `'fill_value': 'extrapolate'` to extrapolate the model above 500 GeV:
+# `'extrapolate': True` to extrapolate the model above 500 GeV:
 #
 
 filename = "$GAMMAPY_DATA/fermi_3fhl/iso_P8R2_SOURCE_V6_v06.txt"
 
 diffuse_iso = create_fermi_isotropic_diffuse_model(
-    filename=filename, interp_kwargs={"fill_value": None}
+    filename=filename, interp_kwargs={"extrapolate": True}
 )
 
 

diff --git a/docs/dev/_downloads/4c5e33d8438fd5229f2e9205d79c47b5/create_region.pdf b/docs/dev/_downloads/4c5e33d8438fd5229f2e9205d79c47b5/create_region.pdf
diff --git a/docs/dev/_downloads/4ea9a264083bf99663b11b14fd6b5368/plot_constant_spectral.zip b/docs/dev/_downloads/4ea9a264083bf99663b11b14fd6b5368/plot_constant_spectral.zip
diff --git a/...ev/_downloads/4f3c47ff11347e8788ce002c9c32adc3/plot_exp_cutoff_powerlaw_norm_spectral.zip b/...ev/_downloads/4f3c47ff11347e8788ce002c9c32adc3/plot_exp_cutoff_powerlaw_norm_spectral.zip
diff --git a/docs/dev/_downloads/51d6cfa441dab374164568c0a25aafdf/plot_snr_radius_evolution.pdf b/docs/dev/_downloads/51d6cfa441dab374164568c0a25aafdf/plot_snr_radius_evolution.pdf
diff --git a/docs/dev/_downloads/5375f8e9e54dd5a68d37e8a2fc4246b9/plot_spiral_arms.png b/docs/dev/_downloads/5375f8e9e54dd5a68d37e8a2fc4246b9/plot_spiral_arms.png
diff --git a/docs/dev/_downloads/5d70733460edff98657b0fd5d0eb69e4/modeling_2D.zip b/docs/dev/_downloads/5d70733460edff98657b0fd5d0eb69e4/modeling_2D.zip
diff --git a/docs/dev/_downloads/5f7885af4d03116bd8091cb6252eae48/analysis_3d.zip b/docs/dev/_downloads/5f7885af4d03116bd8091cb6252eae48/analysis_3d.zip
diff --git a/docs/dev/_downloads/60399e3ce9aa0bfe3b7ca8f286fad1ce/plot_powerlaw_norm_spectral.zip b/docs/dev/_downloads/60399e3ce9aa0bfe3b7ca8f286fad1ce/plot_powerlaw_norm_spectral.zip
diff --git a/docs/dev/_downloads/66ad9a060e067da15dee5cf2536ae998/spectral_analysis_rad_max.zip b/docs/dev/_downloads/66ad9a060e067da15dee5cf2536ae998/spectral_analysis_rad_max.zip
diff --git a/docs/dev/_downloads/6717db513fe7901658f170b575b36cdd/Variability_estimation.zip b/docs/dev/_downloads/6717db513fe7901658f170b575b36cdd/Variability_estimation.zip
diff --git a/docs/dev/_downloads/682e4483582d9fdb778dbd09a795d104/plot_compound.zip b/docs/dev/_downloads/682e4483582d9fdb778dbd09a795d104/plot_compound.zip
diff --git a/docs/dev/_downloads/692bf70e2aa9caeb987bbb35050f71d2/astro_dark_matter.zip b/docs/dev/_downloads/692bf70e2aa9caeb987bbb35050f71d2/astro_dark_matter.zip
diff --git a/docs/dev/_downloads/6e47fca124ba94afacd2e1f76cf61081/plot_template_phase_temporal.zip b/docs/dev/_downloads/6e47fca124ba94afacd2e1f76cf61081/plot_template_phase_temporal.zip
diff --git a/docs/dev/_downloads/70db13717c83b8e636f99ad0018eeb90/plot_template.zip b/docs/dev/_downloads/70db13717c83b8e636f99ad0018eeb90/plot_template.zip
diff --git a/docs/dev/_downloads/73e595818811c6987149d60742eef584/make_reflected_regions.pdf b/docs/dev/_downloads/73e595818811c6987149d60742eef584/make_reflected_regions.pdf
diff --git a/...dev/_downloads/73e7de11148f573eeb51f279652f7b9b/make_rectangular_reflected_background.pdf b/...dev/_downloads/73e7de11148f573eeb51f279652f7b9b/make_rectangular_reflected_background.pdf
diff --git a/docs/dev/_downloads/74468ce448910c5a873be0e51cee13fb/plot_pwn_evolution.pdf b/docs/dev/_downloads/74468ce448910c5a873be0e51cee13fb/plot_pwn_evolution.pdf
diff --git a/docs/dev/_downloads/760eb275a0d8a9d11ea857eb956132f2/plot_naima.zip b/docs/dev/_downloads/760eb275a0d8a9d11ea857eb956132f2/plot_naima.zip
diff --git a/docs/dev/_downloads/7757318506e3a6721d12df18db780f37/plot_sine_temporal.zip b/docs/dev/_downloads/7757318506e3a6721d12df18db780f37/plot_sine_temporal.zip
diff --git a/docs/dev/_downloads/7f0f5ef8ba9bdfd9da1248f73ad010fe/overview.zip b/docs/dev/_downloads/7f0f5ef8ba9bdfd9da1248f73ad010fe/overview.zip
diff --git a/docs/dev/_downloads/800707065c222d9fe3c88a38845901ae/regionmap-2.pdf b/docs/dev/_downloads/800707065c222d9fe3c88a38845901ae/regionmap-2.pdf
diff --git a/docs/dev/_downloads/83da3445f53cc2258537f3ea6b2b0970/regionmap-5.pdf b/docs/dev/_downloads/83da3445f53cc2258537f3ea6b2b0970/regionmap-5.pdf
diff --git a/docs/dev/_downloads/84424d59ec624940199b69d87a792d50/index-1.pdf b/docs/dev/_downloads/84424d59ec624940199b69d87a792d50/index-1.pdf
diff --git a/docs/dev/_downloads/8755395ab1ca43f7e8444bdd5355f7fb/cta_sensitivity.zip b/docs/dev/_downloads/8755395ab1ca43f7e8444bdd5355f7fb/cta_sensitivity.zip
diff --git a/docs/dev/_downloads/879fb38cf085340a15de2c5c775d1fa2/pulsar_analysis.zip b/docs/dev/_downloads/879fb38cf085340a15de2c5c775d1fa2/pulsar_analysis.zip
diff --git a/...downloads/8a9ae62d4481bef2294fabff4afc70cf/gammapy-irf-EnergyDependentMultiGaussPSF-1.pdf b/...downloads/8a9ae62d4481bef2294fabff4afc70cf/gammapy-irf-EnergyDependentMultiGaussPSF-1.pdf
diff --git a/docs/dev/_downloads/8d795d04d6c1419b268a0a4676041f36/model-gallery_python.zip b/docs/dev/_downloads/8d795d04d6c1419b268a0a4676041f36/model-gallery_python.zip
diff --git a/docs/dev/_downloads/8f7cba6e147ac68586bc14a007ba4cc5/plot_spiral_arms.pdf b/docs/dev/_downloads/8f7cba6e147ac68586bc14a007ba4cc5/plot_spiral_arms.pdf
diff --git a/docs/dev/_downloads/90e01209a5243d5c972882c04584c8e3/plot_aeff_param.pdf b/docs/dev/_downloads/90e01209a5243d5c972882c04584c8e3/plot_aeff_param.pdf
diff --git a/docs/dev/_downloads/920df746e67257657f5d44e868b95ff9/fitting.zip b/docs/dev/_downloads/920df746e67257657f5d44e868b95ff9/fitting.zip
diff --git a/docs/dev/_downloads/947d48cd2a213f701fd804045a8e07ba/plot_template_temporal.zip b/docs/dev/_downloads/947d48cd2a213f701fd804045a8e07ba/plot_template_temporal.zip
diff --git a/docs/dev/_downloads/97689216e51c6b88714828e3017abcd6/plot_expdecay_temporal.zip b/docs/dev/_downloads/97689216e51c6b88714828e3017abcd6/plot_expdecay_temporal.zip
diff --git a/docs/dev/_downloads/9784111b1a9a5c8f07b727039a6e8b82/plot_radial_distributions.pdf b/docs/dev/_downloads/9784111b1a9a5c8f07b727039a6e8b82/plot_radial_distributions.pdf
diff --git a/docs/dev/_downloads/9a86f782b420f47c383e0ccef22286f8/fermi_lat.ipynb b/docs/dev/_downloads/9a86f782b420f47c383e0ccef22286f8/fermi_lat.ipynb
@@ -245,7 +245,7 @@
       "cell_type": "markdown",
       "metadata": {},
       "source": [
-        "## Isotropic diffuse background\n\nTo load the isotropic diffuse model with Gammapy, use the\n`~gammapy.modeling.models.TemplateSpectralModel`. We are using\n`'fill_value': 'extrapolate'` to extrapolate the model above 500 GeV:\n\n\n"
+        "## Isotropic diffuse background\n\nTo load the isotropic diffuse model with Gammapy, use the\n`~gammapy.modeling.models.TemplateSpectralModel`. We are using\n`'extrapolate': True` to extrapolate the model above 500 GeV:\n\n\n"
       ]
     },
     {
@@ -256,7 +256,7 @@
       },
       "outputs": [],
       "source": [
-        "filename = \"$GAMMAPY_DATA/fermi_3fhl/iso_P8R2_SOURCE_V6_v06.txt\"\n\ndiffuse_iso = create_fermi_isotropic_diffuse_model(\n    filename=filename, interp_kwargs={\"fill_value\": None}\n)"
+        "filename = \"$GAMMAPY_DATA/fermi_3fhl/iso_P8R2_SOURCE_V6_v06.txt\"\n\ndiffuse_iso = create_fermi_isotropic_diffuse_model(\n    filename=filename, interp_kwargs={\"extrapolate\": True}\n)"
       ]
     },
     {

diff --git a/docs/dev/_downloads/9b87dc4ad92a01355cc5cdce7c2881d3/ring_background.zip b/docs/dev/_downloads/9b87dc4ad92a01355cc5cdce7c2881d3/ring_background.zip
diff --git a/docs/dev/_downloads/a28867a6c5c2c6d9e3f31c1c79412c84/plot_gen_gauss.zip b/docs/dev/_downloads/a28867a6c5c2c6d9e3f31c1c79412c84/plot_gen_gauss.zip
diff --git a/docs/dev/_downloads/a5659940aa3f8f568547d47752a43172/tutorials_jupyter.zip b/docs/dev/_downloads/a5659940aa3f8f568547d47752a43172/tutorials_jupyter.zip
diff --git a/docs/dev/_downloads/a5b2ee0329e727a4750cc6807854a799/plot_snr_brightness_evolution.pdf b/docs/dev/_downloads/a5b2ee0329e727a4750cc6807854a799/plot_snr_brightness_evolution.pdf
diff --git a/docs/dev/_downloads/a60ac3367f6b8b4daf62f7767737c935/regionmap-3.pdf b/docs/dev/_downloads/a60ac3367f6b8b4daf62f7767737c935/regionmap-3.pdf
diff --git a/docs/dev/_downloads/a647e703f1c14b3b2be137109a402268/plot_wstat_significance.pdf b/docs/dev/_downloads/a647e703f1c14b3b2be137109a402268/plot_wstat_significance.pdf
diff --git a/docs/dev/_downloads/a6ff1b10c982034bb913f63627b76412/plot_point.zip b/docs/dev/_downloads/a6ff1b10c982034bb913f63627b76412/plot_point.zip
diff --git a/docs/dev/_downloads/a9d5014c13b41c72b29e8ab09728a51b/plot_logparabola_norm_spectral.zip b/docs/dev/_downloads/a9d5014c13b41c72b29e8ab09728a51b/plot_logparabola_norm_spectral.zip
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diff --git a/docs/dev/_downloads/b3336d8a1b4e8487945a83d57e35ce6b/plot_exp_cutoff_powerlaw_3fgl.zip b/docs/dev/_downloads/b3336d8a1b4e8487945a83d57e35ce6b/plot_exp_cutoff_powerlaw_3fgl.zip
diff --git a/docs/dev/_downloads/ba616a9da5fd4ea6727cee926df2b69e/ebl.zip b/docs/dev/_downloads/ba616a9da5fd4ea6727cee926df2b69e/ebl.zip
diff --git a/docs/dev/_downloads/bc7f4b2c8d9d79b35ecf0b38127aca8c/energy_dependent_estimation.zip b/docs/dev/_downloads/bc7f4b2c8d9d79b35ecf0b38127aca8c/energy_dependent_estimation.zip
diff --git a/docs/dev/_downloads/be73f34ea8068af3a10d3559a704a86c/plot_piecewise_norm_spatial.zip b/docs/dev/_downloads/be73f34ea8068af3a10d3559a704a86c/plot_piecewise_norm_spatial.zip
diff --git a/...v/_downloads/bf0a16a362522ed59ca5852f58d8d53c/plot_super_exp_cutoff_powerlaw_4fgl_dr1.zip b/...v/_downloads/bf0a16a362522ed59ca5852f58d8d53c/plot_super_exp_cutoff_powerlaw_4fgl_dr1.zip
diff --git a/docs/dev/_downloads/bfe6aa14bdebe4f65370b05f400755e5/plot_cash_significance.pdf b/docs/dev/_downloads/bfe6aa14bdebe4f65370b05f400755e5/plot_cash_significance.pdf
diff --git a/docs/dev/_downloads/c1da6aedff551cba26aafdf962f74127/plot_shell.zip b/docs/dev/_downloads/c1da6aedff551cba26aafdf962f74127/plot_shell.zip
diff --git a/docs/dev/_downloads/c2775618fc6e3f5a7b28e723a9132470/plot_aeff.pdf b/docs/dev/_downloads/c2775618fc6e3f5a7b28e723a9132470/plot_aeff.pdf
diff --git a/docs/dev/_downloads/c2b61900ea448b3f1bbacb5848c7ae6e/plot_pulsar_spindown.pdf b/docs/dev/_downloads/c2b61900ea448b3f1bbacb5848c7ae6e/plot_pulsar_spindown.pdf
diff --git a/docs/dev/_downloads/c3e24f907cf5ba5950daf05c578e630c/plot_powerlaw.zip b/docs/dev/_downloads/c3e24f907cf5ba5950daf05c578e630c/plot_powerlaw.zip
diff --git a/docs/dev/_downloads/c6bad13b7bd034ce07497e4d5025d5d2/edisp-1.pdf b/docs/dev/_downloads/c6bad13b7bd034ce07497e4d5025d5d2/edisp-1.pdf
diff --git a/docs/dev/_downloads/c8b2c52022beac75de2a3a8b628986e3/plot_absorbed.zip b/docs/dev/_downloads/c8b2c52022beac75de2a3a8b628986e3/plot_absorbed.zip
diff --git a/docs/dev/_downloads/c8dacdfbdf94c97cce7a5ee9555295b5/plot_cash_errors.pdf b/docs/dev/_downloads/c8dacdfbdf94c97cce7a5ee9555295b5/plot_cash_errors.pdf
diff --git a/docs/dev/_downloads/cbf21326239e0fa794d51e4515e770f5/spectral_analysis_hli.zip b/docs/dev/_downloads/cbf21326239e0fa794d51e4515e770f5/spectral_analysis_hli.zip
diff --git a/docs/dev/_downloads/cf72688370a27db6e3e5a36401e825da/plot_powerlaw2.zip b/docs/dev/_downloads/cf72688370a27db6e3e5a36401e825da/plot_powerlaw2.zip
diff --git a/docs/dev/_downloads/d0da679c6d748017e74a51a72190ec8f/spectrum_simulation.zip b/docs/dev/_downloads/d0da679c6d748017e74a51a72190ec8f/spectrum_simulation.zip
diff --git a/docs/dev/_downloads/d3f2b47ffbc735c23e8ffc373b698607/light_curve.zip b/docs/dev/_downloads/d3f2b47ffbc735c23e8ffc373b698607/light_curve.zip
diff --git a/docs/dev/_downloads/d46f4cc1fb54f9148150a46cabce732a/plot_spiral_arm_models.pdf b/docs/dev/_downloads/d46f4cc1fb54f9148150a46cabce732a/plot_spiral_arm_models.pdf
diff --git a/docs/dev/_downloads/d47b4b3bccd5fc1699bbc9406a3c4035/plot_edisp.pdf b/docs/dev/_downloads/d47b4b3bccd5fc1699bbc9406a3c4035/plot_edisp.pdf
diff --git a/docs/dev/_downloads/d53bfce5727a0e2b74d381cfa51a554d/plot_template_spectral.ipynb b/docs/dev/_downloads/d53bfce5727a0e2b74d381cfa51a554d/plot_template_spectral.ipynb
@@ -29,7 +29,25 @@
       "cell_type": "markdown",
       "metadata": {},
       "source": [
-        "Spectral correction\nCorrections to templates can be applied by multiplication with a normalized spectral model,\nfor example `gammapy.modeling.models.PowerLawNormSpectralModel`.\nThis operation create a new `gammapy.modeling.models.CompoundSpectralModel`\n\n"
+        "## Example of extrapolation\nThe following shows how to implement extrapolation of a template spectral model:\n\n"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "metadata": {
+        "collapsed": false
+      },
+      "outputs": [],
+      "source": [
+        "energy = [0.5, 1, 3, 10, 20] * u.TeV\nvalues = [40, 30, 20, 10, 1] * u.Unit(\"TeV-1 s-1 cm-2\")\ntemplate_noextrapolate = TemplateSpectralModel(\n    energy=energy,\n    values=values,\n    interp_kwargs={\"extrapolate\": False},\n)\ntemplate_extrapolate = TemplateSpectralModel(\n    energy=energy, values=values, interp_kwargs={\"extrapolate\": True}\n)\nenergy_bounds = [0.2, 80] * u.TeV\ntemplate_extrapolate.plot(energy_bounds, label=\"Extrapolated\", alpha=0.4, color=\"blue\")\ntemplate_noextrapolate.plot(\n    energy_bounds, label=\"Not extrapolated\", ls=\"--\", color=\"black\"\n)\nplt.legend()"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {},
+      "source": [
+        "Spectral corrections to templates can be applied by multiplication with a normalized spectral model,\nfor example `gammapy.modeling.models.PowerLawNormSpectralModel`.\nThis operation creates a new `gammapy.modeling.models.CompoundSpectralModel`\n\n"
       ]
     },
     {

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diff --git a/docs/dev/_images/sphx_glr_simulate_3d_001.png b/docs/dev/_images/sphx_glr_simulate_3d_001.png
diff --git a/docs/dev/_images/sphx_glr_simulate_3d_002.png b/docs/dev/_images/sphx_glr_simulate_3d_002.png
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diff --git a/docs/dev/_modules/gammapy/irf/effective_area.html b/docs/dev/_modules/gammapy/irf/effective_area.html
@@ -618,7 +618,7 @@ <h1>Source code for gammapy.irf.effective_area</h1><div class="highlight"><pre>
 <span class="sd">        ----------</span>
 <span class="sd">        ax : `~matplotlib.axes.Axes`, optional</span>
 <span class="sd">            Matplotlib axes. Default is None.</span>
-<span class="sd">        offset : `~astropy.coordinates.Angle`, optional</span>
+<span class="sd">        offset : list of `~astropy.coordinates.Angle`, optional</span>
 <span class="sd">            Offset. Default is None.</span>
 <span class="sd">        kwargs : dict</span>
 <span class="sd">            Forwarded to plt.plot().</span>

diff --git a/docs/dev/_modules/gammapy/modeling/models/cube.html b/docs/dev/_modules/gammapy/modeling/models/cube.html
@@ -1832,7 +1832,7 @@ <h1>Source code for gammapy.modeling.models.cube</h1><div class="highlight"><pre
 <span class="k">def</span> <span class="nf">create_fermi_isotropic_diffuse_model</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
 <span class="w">    </span><span class="sd">&quot;&quot;&quot;Read Fermi isotropic diffuse model.</span>
 
-<span class="sd">    See `LAT Background models &lt;https://fermi.gsfc.nasa.gov/ssc/data/access/lat/BackgroundModels.html&gt;`__  # noqa: E501</span>
+<span class="sd">    See `LAT Background models &lt;https://fermi.gsfc.nasa.gov/ssc/data/access/lat/BackgroundModels.html&gt;`__.</span>
 
 <span class="sd">    Parameters</span>
 <span class="sd">    ----------</span>

diff --git a/docs/dev/_modules/gammapy/modeling/models/spectral.html b/docs/dev/_modules/gammapy/modeling/models/spectral.html
@@ -536,6 +536,7 @@
   <h1>Source code for gammapy.modeling.models.spectral</h1><div class="highlight"><pre>
 <span></span><span class="c1"># Licensed under a 3-clause BSD style license - see LICENSE.rst</span>
 <span class="sd">&quot;&quot;&quot;Spectral models for Gammapy.&quot;&quot;&quot;</span>
+
 <span class="kn">import</span> <span class="nn">logging</span>
 <span class="kn">import</span> <span class="nn">operator</span>
 <span class="kn">import</span> <span class="nn">os</span>
@@ -2079,7 +2080,6 @@ <h1>Source code for gammapy.modeling.models.spectral</h1><div class="highlight">
     <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span>
         <span class="bp">self</span><span class="p">,</span> <span class="n">index</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">norm</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">reference</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">lambda_</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span>
     <span class="p">):</span>
-
         <span class="k">if</span> <span class="n">index</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
             <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span>
                 <span class="s2">&quot;The default index value changed from 1.5 to 0 since v1.2&quot;</span><span class="p">,</span>
@@ -2429,7 +2429,6 @@ <h1>Source code for gammapy.modeling.models.spectral</h1><div class="highlight">
     <span class="n">beta</span> <span class="o">=</span> <span class="n">Parameter</span><span class="p">(</span><span class="s2">&quot;beta&quot;</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
 
     <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">norm</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">reference</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">beta</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
-
         <span class="k">if</span> <span class="n">alpha</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
             <span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span>
                 <span class="s2">&quot;The default alpha value changed from 2 to 0 since v1.2&quot;</span><span class="p">,</span>
@@ -2488,10 +2487,10 @@ <h1>Source code for gammapy.modeling.models.spectral</h1><div class="highlight">
 <span class="sd">    values : `~numpy.ndarray`</span>
 <span class="sd">        Array with the values of the model at energies ``energy``.</span>
 <span class="sd">    interp_kwargs : dict</span>
-<span class="sd">        Interpolation keyword arguments passed to `scipy.interpolate.RegularGridInterpolator`.</span>
-<span class="sd">        By default all values outside the interpolation range are set to zero.</span>
-<span class="sd">        If you want to apply linear extrapolation you can pass `interp_kwargs={&#39;fill_value&#39;:</span>
-<span class="sd">        &#39;extrapolate&#39;, &#39;kind&#39;: &#39;linear&#39;}`. If you want to choose the interpolation</span>
+<span class="sd">        Interpolation option passed to `~gammapy.utils.interpolation.ScaledRegularGridInterpolator`.</span>
+<span class="sd">        By default, all values outside the interpolation range are set to NaN.</span>
+<span class="sd">        If you want to apply linear extrapolation you can pass `interp_kwargs={&#39;extrapolate&#39;:</span>
+<span class="sd">        True, &#39;method&#39;: &#39;linear&#39;}`. If you want to choose the interpolation</span>
 <span class="sd">        scaling applied to values, you can use `interp_kwargs={&quot;values_scale&quot;: &quot;log&quot;}`.</span>
 <span class="sd">    meta : dict, optional</span>
 <span class="sd">        Meta information, meta[&#39;filename&#39;] will be used for serialisation.</span>

diff --git a/docs/dev/_modules/gammapy/utils/interpolation.html b/docs/dev/_modules/gammapy/utils/interpolation.html
@@ -536,6 +536,7 @@
   <h1>Source code for gammapy.utils.interpolation</h1><div class="highlight"><pre>
 <span></span><span class="c1"># Licensed under a 3-clause BSD style license - see LICENSE.rst</span>
 <span class="sd">&quot;&quot;&quot;Interpolation utilities.&quot;&quot;&quot;</span>
+
 <span class="kn">import</span> <span class="nn">html</span>
 <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">compress</span>
 <span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
@@ -604,8 +605,9 @@ <h1>Source code for gammapy.utils.interpolation</h1><div class="highlight"><pre>
         <span class="n">values_scaled</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">scale</span><span class="p">(</span><span class="n">values</span><span class="p">)</span>
         <span class="n">points_scaled</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_scale_points</span><span class="p">(</span><span class="n">points</span><span class="o">=</span><span class="n">points</span><span class="p">)</span>
 
+        <span class="n">kwargs</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="s2">&quot;bounds_error&quot;</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
+
         <span class="k">if</span> <span class="n">extrapolate</span><span class="p">:</span>
-            <span class="n">kwargs</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="s2">&quot;bounds_error&quot;</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
             <span class="n">kwargs</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="s2">&quot;fill_value&quot;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
 
         <span class="n">method</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;method&quot;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>