Library /sys$common/syshlp/PCA$HELP.HLB  —  Frequently Asked Questions, HEX Numbers in CALLTREE Plots
    Why are HEX numbers showing up in the CALL_TREE plot?

    The Analyzer was not able to symbolize the return address it
    found in the call stack. If IO_SERVICES or SERVICES data is being
    gathered, these may be addresses in the relocated system service
    vector.
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