old_contents: from TDEM import hzAnalyticDipoleT
  from FDEM import hzAnalyticDipoleF
  from FDEMcasing import *
  from DC import DCAnalyticHalf, DCAnalyticSphere
  from FDEM_fields import *
  
new_contents: from TDEM import hzAnalyticDipoleT
  from FDEM import hzAnalyticDipoleF
  from FDEMcasing import *
  from DC import DCAnalyticHalf, DCAnalyticSphere
  from FDEMDipolarfields import *
  
subject: change FDEM_fields.py to FDEMDipolarfield.py