But === The aim of this operator is to calculate the reinforcement densities in surface (2D) and linear (1D) elements as a function of the stresses for several load combinations. As input, this macro-command takes a multiple result of type mult_elas. Each of the results of mult_elas contains the generalized efforts, previously obtained by option EFGE_ELNO. The command enriches each result of mult_elas with a reinforcement size field, by calling the CALC_FERRAILLAGE command several times. Also, the command adds results to the mult_elas data structure.