% Cai.m % internal Calcium % % % $Revision:$ % function dCa_i = cai(V_M, Ca_i, I_CaL, I_S) phi_Ca_i = 52/2; beta_Ca_i = 1/20; % Traub 2003: 20 - 50ms gamma_Ca_i = 0.7; dCa_i = - phi_Ca_i * I_CaL - beta_Ca_i * Ca_i - gamma_Ca_i * I_S;