code: def ccmodmd_setcoef(k):
      
  
      # Set working coefficient maps for ccmod step and compute DFT of
      # coefficient maps Z
      mp_Zf[k] = sl.rfftn(mp_Z_Y1[k], mp_cri.Nv, mp_cri.axisN)
docs: Set the coefficient maps for the ccmod stage. The only parameter is
      the slice index `k` and there are no return values; all inputs and
      outputs are from and to global variables.