STEP07:
  Python version: 3.6.9
  The 2D diffusion equation.
  Saved initial solution in file "step07_initial.png".
  Saved initial solution in file "step07_10.png".
  Saved initial solution in file "step07_14.png".
  Saved initial solution in file "step07_50.png".

STEP07:
  Normal end of execution.