In the Analyzer, nodespecs are required on PLOT and TABULATE
    commands to define how to partition the histogram or table
    into buckets. Depending on the partitioning you specify, the
    Analyzer selects a data domain and partitions it into value
    ranges (buckets).

    The buckets are then displayed along the vertical axis of the
    histogram. The Analyzer accepts a wider range of nodespecs than
    the Collector does because Analyzer nodespecs can cover domains
    other than the program address domain.

    The following nodespec specifies a set of buckets. It consists
    of an address range specification, followed by a BY clause. The
    result is a plot which shows one histogram bar for each routine
    in module M1.
 PCAC> PLOT MODULE M1 BY ROUTINE

    See Program_Address_Domain and Non-Program_Address_Domains in
    this HELP entry for nodespecs that are valid in the Analyzer.