Update README.md

README.md

@@ -1,6 +1,6 @@
 # caustics-display
 
-A simple C++ program used to verify the caustics pattern produced by the output of [Kassubeck et al.'s implementation](https://github.com/CompN3rd/ShapeFromCaustics/tree/main/schwartzburg_2014) of Schwartzburg at al.'s [High-contrast computational caustic design](https://dl.acm.org/doi/10.1145/2601097.2601200).
+A simple C++ program used to verify the caustics pattern produced by the output of [Kassubeck et al.'s implementation](https://github.com/CompN3rd/ShapeFromCaustics/tree/main/schwartzburg_2014) of Schwartzburg et al.'s [High-contrast computational caustic design](https://dl.acm.org/doi/10.1145/2601097.2601200).
 
 ## Dependencies
 
@@ -11,7 +11,7 @@ Make sure to include these when building the program.
 ## How to use
 
 1. First build the caustics display executable.
-2. Run Kassubeck at al.'s implementation to obtain an .obj file for your target image. The target image must be 256x256 pixels.
+2. Run Kassubeck et al.'s implementation to obtain an .obj file for your target image. The target image must be 256x256 pixels.
 3. Place the .obj file in the same directory as the built executable.
 4. Open the command line in the same directory, and run:
 `causticsdisplay.exe [filename].obj [receiver_plane]`
@@ -28,7 +28,7 @@ Make sure to include these when building the program.
 ![target](./img/target.png)
 <br>Photo of a marble fox I found on Google, made grayscale and shrunk down to 256x256
 
-### Screenshot of the .obj file / lens shape generated by Kassubeck at al.'s code
+### Screenshot of the .obj file / lens shape generated by Kassubeck et al.'s code
 
 ![lens](./img/lens.png)
 <br> (file too large to upload to GitHub - I've uploaded it [here](https://mega.nz/file/2593DAST#vWJQIVjO7D_PTpi0Drja8bFXgGCo55YhR6MlpsjPxXI) to test with yourself!)