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

       /MINIMUM=n
       /NOMINIMUM

    Determines whether to omit buckets that fall below a minimum
    percentage. The /MINIMUM=n qualifier specifies that buckets whose
    percentage falls below n% should be omitted from the histogram.
    The /NOMINIMUM qualifier specifies that no minimum threshold
    applies.

    Note that /NOMAXIMUM, /NOMINIMUM, and /ZEROS are the default
    bucket selection qualifiers.