Library /sys$common/syshlp/pca$help.hlb PLOT, Design qualifiers, /SCALE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SCALE=n
       /NOSCALE

    Determines whether fixed or adjusted histogram scale is used.
    The /SCALE=n qualifier allows you to select a fixed scale for the
    plot. The /NOSCALE default qualifier selects adjusted scaling,
    which causes the longest bar on the histogram to occupy the full
    width of the plot.

    Note that /FILL=("*","O","x","@",":","#","/","+"), /NOSCALE and
    /NOWRAP are the default design qualifiers.