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

 nodespec

    Specifies a program location. Node specifications (nodespecs)
    on PLOT and TABULATE commands define how the vertical axis of a
    histogram or table is partitioned into buckets. For example, the
    node specification PROGRAM_ADDRESS BY ROUTINE selects the program
    address domain, the domain of all possible program addresses.
    From this domain, it selects the address ranges of the routines
    in the program. Each of these address ranges defines a bucket.

    See HELP Nodespecs for information about node specifications.