# Capillary Pressure

User can use his own capillary pressure function through a Python function _CapiFunction(double\_array, int\_array)_ in "TOUGH\_python\_module.py" _,_ if ICP=41. See [Appendix B](../../appendix/b-capillary-pressure-functions/icp-41-user-defined-capillary-pressure-function) for details.
