; XAXIS
;---------------------------------------------------------------
;! Which parameter is plotted on the horizontal axis.
;# ADVERB PLOT
;-----------------------------------------------------------------------
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;-----------------------------------------------------------------------
XAXIS     LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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XAXIS
Type: Adverb (Real)
Use:  To describe the parameter to appear on the X-axis (horizontal).
Tasks:
  ELFIT.....Plots/fits selected contents of SN, TY, SY, PC or CL files.
            XAXIS selects the variable against which the data are fit.
  SNPLT.....Plots selected contents of SN, TY, PC or CL files.
            XAXIS is the code number for the data that controls the X
            axis position of the plotted points.
  SYVSN.....Plots selected SY/TY data with SN solution values versus
            time.  XAXIS selects the variable on the X axis and
            allows SY versus SN plots as well.
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