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SET_XMAN()                                                         T_EXAM21
   Toggles the X axis from automatic to manual scaling.

   Syntax
         nOnOrOff = SET_XMAN([nOnOrOff])

   Arguments
         OPTIONAL PARAMETERS
         nOnOrOff    Toggles the automatic scaling on the X axis.
                     0 - off [default], 1 - on.

   Returns
         nOnOrOff    Returns whether the automatic scaling is on or off.
                     0 - automatic scaling.
                     1 - manual scaling.

   Description
         SET_XMAN() toggles the X axis from automatic to manual scaling. The
         default is automatic. A value of 1 sets manual scaling on, 0 sets it
         off.

   Background
         When the PLOT() or PIE() functions are called, the automatic axis
         scaling routine calculates the high, low, and increment for the
         scale based on the high and low values of the data set. The high
         and low values for the data set can be modified with SET_XMAX() and
         SET_XMIN(). The automatic scaling will then use those values as the
         high and low for the data set; however, the automatic scaling will
         still modify the high, low, and increment values so the axes will
         be evenly spaced and increments with evenly rounded numbers. You
         can override all automatic scaling by setting all three functions:
         SET_XMAX(), SET_XMIN() and SET_XINC(). The scale will match your
         values exactly.