I've wanted to propose a small change (via a pull request) to make your plot() safer,
-- I still will do that to fix the current problem with "R-devel"
-> https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-gcc/SortedEffects-00check.html
but then noticed that the CRAN version is newer (ver. 1.7.0) than this one (1.6.0).
Can you please update this GH repos from CRAN's (or an even newer version you maintain "privately") ?
Thank you and best regards.