reg_epsilon       148 old_code/tumor_growth/tumor_growth.h       reg_epsilon {epsilon_regularization_parameter}, delta {delta_parameter}
reg_epsilon       180 old_code/tumor_growth/tumor_growth.h     const double reg_epsilon;
reg_epsilon       388 old_code/tumor_growth/tumor_growth.h     a_dX_p *= (reg_alpha + reg_epsilon * tp.deltaT());