This code is also available on github (https://github.com/trentagon/pigeon). Go there to find the corresponding manuscript and more code description. This set of Matlab codes runs our model for the evolution of nitrogen in the Martian atmosphere over the last 3.8 billion years - A.K.A. “PIGEON”. The data used to generate figures 1, 2, and 3 in the corresponding manuscript can be found in the folders labeled "fig1", "fig2", and "fig3".