After the calculations, this record will be filled with the ratio of the the internal forces (out-of-balance forces) and the external forces. The internal forces are taken from the post_node_rhside_free record. The external forces are taken from the post_node_rhside_fixed record. The maximum ratio for the unknowns is used.
As an expeption, if the external forces are very low (below 1.e-6), the ratio is directly filled with the internal forces and so represent an absolute value of unbalance and no unbalance ratio.
See also post_node_rhside_ratio_unknowntypes.