NEURON { POINT_PROCESS calciumgap NONSPECIFIC_CURRENT ig USEION ca READ cai WRITE ica RANGE r, cap, ig, ica POINTER vgap, cagap } UNITS { (mV) = (millivolt) (mA) = (milliamp) } PARAMETER { v (mV) vgap (mV) cai (micromolar) cagap (micromolar) r = 1e10 (megaohm) cap = 0.3 } ASSIGNED { ig (nanoamp) ica (nanoamp) } BREAKPOINT { ica = cap*((v - vgap)-(25.69*log(cagap/cai)))/r ig = ((v - vgap)/r) - ica }