This is the PISM code version used for the Antarctic Ice Sheet hysteresis simulations published and discussed in<br><br>Garbe, J., Albrecht, T., Levermann, A., Donges, J. F., and Winkelmann, R. The hysteresis of the Antarctic Ice Sheet. Nature 585(7826), 2020.<br><br>The code is based on PISM release v1.0, but contains several improvements and modifications