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

       /FILL=("*","O","x","@",":","#","/","+")

    Specifies the fill to be used for the first, second, etc., data
    kind in a plot. A maximum of eight character strings can be
    defined, and each must be delimited by double or single quotation
    marks.

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