code: def isxmap(xmethod, opt):
      
  
      if xmethod == 'admm':
          isx = {'XPrRsdl': 'PrimalRsdl', 'XDlRsdl': 'DualRsdl',
                 'XRho': 'Rho'}
      else:
          isx = {'X_F_Btrack': 'F_Btrack', 'X_Q_Btrack': 'Q_Btrack',
                 'X_ItBt': 'IterBTrack', 'X_L': 'L', 'X_Rsdl': 'Rsdl'}
      if not opt['AccurateDFid']:
          isx.update(evlmap(True))
      return isx
docs: Return ``isxmap`` argument for ``.IterStatsConfig`` initialiser.