The appendix contains a fixed version of "hdtbl.tmac" and "hdtbl.misc".
The option '-ww' can be used without being flooded with warnings. People can make their own diff files to see the changes. Was tested with the ms file "build/doc/ms.ms" (Debian /usr/share/doc/groff-base/ms.ms.gz) by adding .LP .mso hdtbl.tmac .hd*TBL .hd*TR .hd*TD "contents of the table cells" .hd*ETB in two places in the "ms.ms" file. (or dropping the line .mso hdtbl.tmac and adding the "-mhdtbl" on the command line) using [test-]groff -ms -t -p -e -Tpdf -M ~/tmp/hdtbl [-mhdtbl] -ww <input file> > <output> where -M <hdtbl directory> shows where to find the new version of the "hdtbl.*" files.
