/INDENT
       /NOINDENT (default)

    Controls how many spaces the header levels after level 1 are
    indented in the table of contents.

    If you omit this qualifier, or if you specify the /NOINDENT
    qualifier, all header levels after header level 1 are indented
    2 spaces.

    If you specify the /INDENT qualifier, each header level after
    header level 1 is indented 2 spaces beyond the preceding header
    level.