/MAIN_IMAGE[=n[:m]]
       /MAIN_IMAGE[=prog-unit]

    Specifies to use the first call stack PC value that falls in your
    program's main image, when tallying program addresses. You may
    specify the PC value to be n or the range n:m. If you specify a
    program unit or address range, it will select the first PC value
    in that address. The /NOMAIN_IMAGE qualifier specifies to use the
    original program counter value for each data point, to tally the
    data point.

    Note that /NOCUMULATIVE, /NOMAIN_IMAGE and /NOSTACK_DEPTH are the
    default program address selection qualifiers.