This code helmhole constructs synthetic electron hole axisymmetric equilibria Provided it has link access to libX11, it can be made on linux by typing "make" at the command line. Then ./helmhole -h will give some help. Without switches it will calculate and display the figures of the paper: "Synthetic Multidimensional Plasma Electron Hole Equilibria", by I H Hutchinson (2021). Copyright (C) Ian H Hutchinson 2021. It may freely be used at your own risk provided that any publication references the above paper. No warranty for any use is given or implied.