mass_matrix_rhs   240 old_code/tumor_growth/tumor_growth.h     double mass_matrix_rhs {0.};
mass_matrix_rhs   479 old_code/tumor_growth/tumor_growth.h     mass_matrix_rhs = uniform_time_step * gamma * a_or_b;
mass_matrix_rhs   495 old_code/tumor_growth/tumor_growth.h     ones_chi = Range {mass_matrix_rhs};