/CHAIN_NAME
       /NOCHAIN_NAME

    Specifies to use the comma list form of presentation on the plot
    for call trees. /NOCHAIN_NAME specifies to use the indentation
    form. If you specify /NOCHAIN_NAME, then the PLOT command's
    maximum and mininum sorting qualifiers are not in effect. If
    you specify /CHAIN_NAME, then /NOZEROS is in effect.

    Note that /NOCHAIN_NAME and /NOPATHNAME are the default CALL_TREE
    domain qualifiers.