Originally posted by **softhorizons** October 13, 2022
In renlinear.ps, line# 231
guardleftpos neg guardwidth add guardleftypos guardwidth 2 div add moveto
should read
guardleftpos neg guardwidth add guardleftypos guardheight 2 div add moveto
Currently, left & right guard heights are very slightly uneven because of this.
Discussed in https://github.com/bwipp/postscriptbarcode/discussions/212