Hello,
I am using PL plot via the gtkmm wrapper library, however, I believe the following is an issue with plpot, not gtkmm plplot, the developer indicate this is true also.

See screenshot below, the issue is when using subscripts they overlap the legend box.

IMO, on a side point subscripts are set too low anyway, they should bisect the lowest point of the preceding normal letter/character, not below it, but even if the legend box was a bit taller so the subscript doesn't clip the legend box, that would be great, can this be fixed ?

https://drive.google.com/file/d/1hsvz1GRRugJSPT-jKx4nB2wLrLOzAc4D/view?usp=sharing

Best regards,