boltz_dist()
energetic_degeneracy()
arb_disps_1d()
eight_point_1d()
eight_point_2d()
four_point_1d()
four_point_2d()
get_pos_neg_gradients()
six_point_1d()
six_point_2d()
two_point_1d()
two_point_2d()
numerical_frequencies()
correct_phase_angle()
get_theta()
perform_phase()
transform_array_to_df()
rmass_cart()
rmass_mwc()
compute_d_dq()
compute_d_dq_sf()
sf_to_so()
backscat()
forwscat()
make_derivatives()