:term:`CFOUR_SCALE_ON <CFOUR_SCALE_ON (CFOUR)>`
"""""""""""""""""""""""""""""""""""""""""""""""

      Controls whether step scaling is based on the absolute step length (1-norm) (=0 or MAG(S)) or the largest individual step in the internal coordinate space (=1 or MAX(S)).

      * **Type**: string
      * **Possible Values**: MAG(S), MAX(S)
      * **Default**: MAG(S)