σ instead of υ

Attestations in Trismegistos Text irregularities

This text irregularity has been corrected by a modern editor 5 time(s) in Trismegistos Text irregularities;
   in 4 different contexts (before and after);
       following 4 different groups;
       preceding 4 different groups.

Less than 10 attestations. For a network of text irregularities based on co-occurrence in the same text, see here

Contexts of this text irregularity (σ instead of υ)
Context	Frequency
after α and before τ	2	(all types of errors in this context)
after ε and before ου	1	(all types of errors in this context)
after η and before ι	1	(all types of errors in this context)
after ρ and before ω	1	(all types of errors in this context)

Graphemes preceding this text irregularity (σ instead of υ)
Context	Frequency
after α	2	(all types of errors in this context)
after ε	1	(all types of errors in this context)
after η	1	(all types of errors in this context)
after ρ	1	(all types of errors in this context)

Graphemes following this text irregularity (σ instead of υ)
Context	Frequency
before τ	2	(all types of errors in this context)
before ι	1	(all types of errors in this context)
before ου	1	(all types of errors in this context)
before ω	1	(all types of errors in this context)