diff --git a/tests/testthat/_snaps/bam-ar/draw-bam-ar-1-factor-by.svg b/tests/testthat/_snaps/bam-ar/draw-bam-ar-1-factor-by.svg
index 581be4364..04ced9d1e 100644
--- a/tests/testthat/_snaps/bam-ar/draw-bam-ar-1-factor-by.svg
+++ b/tests/testthat/_snaps/bam-ar/draw-bam-ar-1-factor-by.svg
@@ -39,6 +39,16 @@
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diff --git a/tests/testthat/_snaps/basis/draw-basis-works-with-a-gam-multiple-smooths.svg b/tests/testthat/_snaps/basis/draw-basis-works-with-a-gam-multiple-smooths.svg
index 07b9a198d..aad4aaa44 100644
--- a/tests/testthat/_snaps/basis/draw-basis-works-with-a-gam-multiple-smooths.svg
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diff --git a/tests/testthat/_snaps/by-variables/draw-gam-user-select-and-parametric-true.svg b/tests/testthat/_snaps/by-variables/draw-gam-user-select-and-parametric-true.svg
index dfb062bea..0ca5c707b 100644
--- a/tests/testthat/_snaps/by-variables/draw-gam-user-select-and-parametric-true.svg
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Basis: TPRS
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diff --git a/tests/testthat/_snaps/compare-smooths/compare-smooths-all-smooths.svg b/tests/testthat/_snaps/compare-smooths/compare-smooths-all-smooths.svg
index 687239faf..d1c040695 100644
--- a/tests/testthat/_snaps/compare-smooths/compare-smooths-all-smooths.svg
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diff --git a/tests/testthat/_snaps/compare-smooths/compare-smooths-bottom-legend.svg b/tests/testthat/_snaps/compare-smooths/compare-smooths-bottom-legend.svg
index 267ca998d..c88cb7e5d 100644
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diff --git a/tests/testthat/_snaps/compare-smooths/compare-smooths-set-nrow-ncol.svg b/tests/testthat/_snaps/compare-smooths/compare-smooths-set-nrow-ncol.svg
index e6ce0a287..b13836ba2 100644
--- a/tests/testthat/_snaps/compare-smooths/compare-smooths-set-nrow-ncol.svg
+++ b/tests/testthat/_snaps/compare-smooths/compare-smooths-set-nrow-ncol.svg
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diff --git a/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-complex-factor-by.svg b/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-complex-factor-by.svg
index ecff388ab..cc2617e99 100644
--- a/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-complex-factor-by.svg
+++ b/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-complex-factor-by.svg
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diff --git a/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-factor-by.svg b/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-factor-by.svg
index 4dc996fb3..d65b60b46 100644
--- a/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-factor-by.svg
+++ b/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-factor-by.svg
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diff --git a/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-gamm-factor-by.svg b/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-gamm-factor-by.svg
index 9c68ddd3f..9db0bb87e 100644
--- a/tests/testthat/_snaps/derivatives/draw-issue-47-derivatives-for-gamm-factor-by.svg
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diff --git a/tests/testthat/_snaps/derivatives/draw-issue-47-derivs-for-ordered-factor-by.svg b/tests/testthat/_snaps/derivatives/draw-issue-47-derivs-for-ordered-factor-by.svg
index 523dfbe43..3c88fd83a 100644
--- a/tests/testthat/_snaps/derivatives/draw-issue-47-derivs-for-ordered-factor-by.svg
+++ b/tests/testthat/_snaps/derivatives/draw-issue-47-derivs-for-ordered-factor-by.svg
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diff --git a/tests/testthat/_snaps/diagnostic-plots/appraise-diagnostic-plots.svg b/tests/testthat/_snaps/diagnostic-plots/appraise-diagnostic-plots.svg
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--- a/tests/testthat/_snaps/diagnostic-plots/appraise-diagnostic-plots.svg
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Method: simulate
QQ plot of residuals
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Family: gaussian
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--- a/tests/testthat/_snaps/diagnostic-plots/appraise-worm-plot.svg
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Method: simulate
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diff --git a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-bam.svg b/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-bam.svg
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--- a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-bam.svg
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--- a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-gam-fixed-scales.svg
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index b69c7a2ad..28b644436 100644
--- a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-gam-inc-grp-means.svg
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--- a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-gam-ref-line.svg
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--- a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-gam-user-data.svg
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--- a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-gamm.svg
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--- a/tests/testthat/_snaps/difference-smooths/draw-difference-smooths-gamm4.svg
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index a9f365b3e..5165c2ac9 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-2-fac-parametric.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-2-fac-parametric.svg
@@ -39,6 +39,46 @@
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@@ -89,16 +129,6 @@
s(x0)
Basis: TPRS
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@@ -149,16 +179,6 @@
s(x1)
Basis: TPRS
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@@ -217,16 +237,6 @@
s(x2)
Basis: TPRS
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@@ -269,16 +279,6 @@
fac
Factor
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-2-fac.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-2-fac.svg
index 7bcf27f2b..9995bd8ac 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-2-fac.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-2-fac.svg
@@ -39,6 +39,26 @@
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@@ -89,16 +109,6 @@
s(x0)
Basis: TPRS
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@@ -149,16 +159,6 @@
s(x1)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-ar1-by.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-ar1-by.svg
index 2e21749df..d61b68f2a 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-ar1-by.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-ar1-by.svg
@@ -39,6 +39,16 @@
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@@ -90,16 +100,6 @@
s(x)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-bam.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-bam.svg
index 75557170a..6a4e67452 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-bam.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-bam.svg
@@ -39,6 +39,36 @@
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@@ -88,16 +118,6 @@
s(x0)
Basis: TPRS
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@@ -147,16 +167,6 @@
s(x1)
Basis: TPRS
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@@ -210,16 +220,6 @@
s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant-fun.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant-fun.svg
index e5175a3fc..2bc4cb049 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant-fun.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant-fun.svg
@@ -39,6 +39,36 @@
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@@ -89,16 +119,6 @@
s(x0)
Basis: TPRS
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@@ -156,16 +176,6 @@
s(x1)
Basis: TPRS
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@@ -219,16 +229,6 @@
s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant.svg
index 9b4f3b8c9..8153ce455 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-constant.svg
@@ -39,6 +39,36 @@
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@@ -91,16 +121,6 @@
s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-fun.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-fun.svg
index a5d3038b4..61114b4d8 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-fun.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-fun.svg
@@ -39,6 +39,36 @@
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@@ -85,16 +115,6 @@
s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-rotated.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-rotated.svg
index d74bc0fb4..abdacccc9 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-rotated.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam-rotated.svg
@@ -39,6 +39,36 @@
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@@ -88,16 +118,6 @@
s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam.svg
index b96f4c624..96dbc345e 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gam.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gam.svg
@@ -39,6 +39,36 @@
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s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gamgcv.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gamgcv.svg
index 1ba284a93..2a1c412a6 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gamgcv.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gamgcv.svg
@@ -39,6 +39,36 @@
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s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm.svg
index 1222f9edd..ca3cd42d6 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm.svg
@@ -39,6 +39,36 @@
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s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm4.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm4.svg
index 5c4c0cef6..4f1bc61fc 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm4.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gamm4.svg
@@ -39,6 +39,36 @@
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@@ -88,16 +118,6 @@
s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-gaulss.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-gaulss.svg
index 8c2208c0e..184d1bd83 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-gaulss.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-gaulss.svg
@@ -39,6 +39,36 @@
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@@ -88,16 +118,6 @@
s(x0)
Basis: TPRS
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s(x1)
Basis: TPRS
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s(x2)
Basis: TPRS
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm-parametric.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm-parametric.svg
index 64e3e77c8..ac56a2a99 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm-parametric.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm-parametric.svg
@@ -39,6 +39,46 @@
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@@ -89,16 +129,6 @@
s(x1)
Basis: TPRS
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@@ -157,16 +187,6 @@
s(x2)
Basis: TPRS
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@@ -209,16 +229,6 @@
fac
Factor
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@@ -269,16 +279,6 @@
ff
Factor
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diff --git a/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm.svg b/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm.svg
index f098b0d79..01989e390 100644
--- a/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm.svg
+++ b/tests/testthat/_snaps/draw-gam/draw-gam-m-para-sm.svg
@@ -39,6 +39,16 @@
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