The program "Eject!" calculates the trajectories of ballistic projectiles from volcanic eruptions (Mastin, 2001; 2011). The code was originally written in Visual Basic, which we have now translated into an editable Matlab procedure (Strehlow et al., 2017). Input parameters used here are exemplary for the case of Ruapehu volcano, but can be adapted to any specific case. Additionally, we have written a short script that compares the flight trajectory to the topography of the volcano to determine the flight distance
