display side by side

Co-authored-by: Marianne Corvellec <marianne.corvellec@ens-lyon.org>

Author: JeremyPike

episodes/03-skimage-images.md

@@ -416,9 +416,9 @@ Finally, display the original and modified images. Note that we have to specify
 
 ```python
 fig, ax = plt.subplots()
-plt.imshow(sudoku, cmap="gray", vmin=0, vmax=255)
-fig, ax = plt.subplots()
-plt.imshow(sudoku_gray_background, cmap="gray", vmin=0, vmax=255)
+fig, ax = plt.subplots(ncols=2)
+ax[0].imshow(sudoku, cmap="gray", vmin=0, vmax=255)
+ax[1].imshow(sudoku_gray_background, cmap="gray", vmin=0, vmax=255)
 ```
 
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