  plspage(xp, yp, xleng, yleng, xoff, yoff)
  *****************************************

  plspage

  Sets the page configuration (optional). Not all parameters recognized by
  all drivers. The X-window driver uses the length and offset parameters to
  determine the window size and location. This routine, if used, must be
  called before initializing PLplot.

  xp (PLINT *, output):  Number of pixels, x.

  yp (PLINT *; output):  Number of pixels, y.

  xleng (PLINT *, output):  Page length, x.

  yleng (PLINT *, output):  Page length, y.

  xoff (PLINT *, output):  Page offset, x.

  yoff (PLINT *, output):  Page offset, y.

