ει instead of ο

Attestations in Trismegistos Text irregularities

This text irregularity has been corrected by a modern editor 6 time(s) in Trismegistos Text irregularities;
   in 5 different contexts (before and after);
       following 4 different groups;
       preceding 3 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 (ει instead of ο)
Context	Frequency
after χ and before ν	2	(all types of errors in this context)
after λ and before τ	1	(all types of errors in this context)
after π and before ρ	1	(all types of errors in this context)
after π and before τ	1	(all types of errors in this context)
after ρ and before ν	1	(all types of errors in this context)

Graphemes preceding this text irregularity (ει instead of ο)
Context	Frequency
after π	2	(all types of errors in this context)
after χ	2	(all types of errors in this context)
after λ	1	(all types of errors in this context)
after ρ	1	(all types of errors in this context)

Graphemes following this text irregularity (ει instead of ο)
Context	Frequency
before ν	3	(all types of errors in this context)
before τ	2	(all types of errors in this context)
before ρ	1	(all types of errors in this context)