"mom": Effect of TAB character?

[Steve Ross]

Hi,
A question on the "mom" macro set (version "mom-2.4-4_e") with "groff" 1.22.4 
with regard to the TAB character...

I have attached four files.
- "correct-author-name.mom" -- a six-line "mom" file.  This file correctly 
produces "correct-author-name.pdf".
- "correct-author-name.pdf" -- The PDF output of "mom" and "groff".
- "issue-author-name.mom" -- This file is identical to the first ".mom" file, 
except that I appended a TAB character to the end of the ".AUTHOR_COLOR coral" 
line.

- "issue-author-name.pdf"  -- The incorrect PDF output that features an 
unexpected right square brace and the author's name in the color black instead 
of the color coral.

Why does the TAB character have the unexpected effect?Should I avoid using TABs 
in favor of spaces?(I inserted the TAB for the purpose of moving to the right 
of the text AUTHOR_COLOR to add a comment to the end of the line.)
Thanks in advance for any help,-- Steve Ross

issue-author-name.pdf
Description: Adobe PDF document

issue-author-name.mom
Description: Binary data

correct-author-name.pdf
Description: Adobe PDF document

correct-author-name.mom
Description: Binary data