mass_matrix_lhs   237 old_code/tumor_growth/tumor_growth.h     double mass_matrix_lhs {0.};
mass_matrix_lhs   465 old_code/tumor_growth/tumor_growth.h       mass_matrix_lhs = 1. + uniform_time_step * gamma;
mass_matrix_lhs   470 old_code/tumor_growth/tumor_growth.h       mass_matrix_lhs = 1.;
mass_matrix_lhs   504 old_code/tumor_growth/tumor_growth.h     u_p_chi *= mass_matrix_lhs;