  plsfam(fam, num, bmax)
  **********************

  plsfam

  Sets variables dealing with output file familying. Does nothing if
  familying not supported by the driver. This routine, if used, must be
  called before initializing PLplot. See Section [*] for more information.

  fam (PLINT, input): Family flag (boolean). If nonzero, familying is
  enabled.

  num (PLINT, input): Current family file number.

  bmax (PLINT, input): Maximum file size (in bytes) for a family file.

