Thanks Martin

That (therion/therion@d6d9a18) solves the Sau’s colour map-fg altitude problem for me, presumably for Sau as well.

Recall my post of 20 April 2026 “[Therion] th_formdef.tex runaway text error”, where I described scenarios that triggered “pdftex exit code – 1”.

colour map-fg [triplet]

colour map-fg scrap

colour map-fg map

all seemed to trigger the error for large enough outputs, but

colour map-fg [integer] and

colour map-fg altitude

are less error prone but still error for a long enough passage.

Although my problem only manifests in a single Therion dataset, is it possible that there could be a similar root cause (and solution)?

Bruce