old_contents: from .potential import *
  
  import os
  project_path = os.path.split(os.path.split(__file__)[0])[0]
  del os
  
  # Global parameters
  ETOL = 1E-7
  
new_contents: import os
  project_path = os.path.split(os.path.split(__file__)[0])[0]
  del os
  
  # Global parameters
  ETOL = 1E-7
  
subject: remove potential import