This code is for calculating asymmetric electron holes in a plasma. On linux the executable is created by $ make asymhill Then $ ./asymhill -h will give terse help. The figures of the paper AsymHill.tex are included but can be recreated by running the plots.sh script. Copyright Ian H Hutchinson 2021. Permission to use the code is freely granted provided any publication that uses it references this repository. No warranty whatever for any purpose is given.