Set npx to nt - not sure why

app.py

@@ -11,13 +11,14 @@ def compute_radon_fn(image,
     else:
         image_gray = image
 
-    M, N = image_gray.shape
+    nt, nh = image_gray.shape
     # Define axes centered around zero.
-    taxis = np.linspace(-M/2, M/2, M)   # time axis (rows)
-    haxis = np.linspace(-N/2, N/2, N)   # spatial axis (columns)
+    taxis = np.linspace(-nt/2, nt/2, nt)   # time axis (rows)
+    haxis = np.linspace(-nh/2, nh/2, nh)   # spatial axis (columns)
     # Set detector axis (pxaxis) to cover the full image diagonal.
-    L = int(np.ceil(np.sqrt(M**2 + N**2)))
-    pxaxis = np.linspace(-L/2, L/2, L)
+    # L = int(np.ceil(np.sqrt(M**2 + N**2)))
+    npx = nt # why?
+    pxaxis = np.linspace(-npx/2, npx/2, npx)
 
     print(f"Shapes:\n taxis:{taxis.shape}, haxis:{haxis.shape}, pxaxis:{pxaxis.shape}")