On my system, the figure captions in Guidebook.ps were getting set in
Courier roman. This was clearly unintentional. Here's why it didn't
work.
1. Figures 1 and 2 selected the previous font, but only after a table
had been set. But tbl(1) does not preserve identity of the previous
font. I investigated, and none of GNU, Heirloom Doctools, nor
Documenter's Workbench tbl implementations preserve it. So the user
can't rely on it. See
<https://savannah.gnu.org/bugs/index.php?64862>.
2. Figure 3 attempted to select the roman font (typically Times), but
did so in a table cell that was empty of text. It therefore did not
have any visible effect.
* doc/Guidebook.mn: Explicitly select font `R` after setting tables. On
typesetters, put half a vee of space between the table's box border
and the figure caption.
9658f6769d