Update acoustic_2D.py

Author: hermes-senger

examples/acoustic_2D.py

@@ -45,11 +45,10 @@
 )
 
 # Velocity model
-#vel = np.zeros(shape=(512, 512), dtype=np.float32)
 vel = np.zeros(shape=(512, 512), dtype=np.float32)
 vel[:] = 1500.0
-#vel[100:] = 2000.0
-#vel[1,1]=4500
+vel[100:] = 2000.0
+
 # create the space model
 space_model = SpaceModel(
     bounding_box=(0, 5120, 0, 5120),