But === POST_DYNA_ALEA allows you to perform two types of post-processing after a stochastic dynamics calculation: **Calculation of fragility curves from a table containing the results of a Monte Carlo simulation** From a table [table_sdaster] containing information on the levels of excitation (in seismic analysis, PGA is generally chosen) and the variable of interest characterizing the failure or not of the structure, POST_DYNA_ALEA makes it possible to determine the parameters of a fragility curve according to the lognormal model and to calculate the values of this curve. The reader can consult [U2.08.05] for a more detailed description. **Statistically post-processing of cross-spectrum results.** POST_DYNA_ALEA makes it possible to calculate statistical parameters on functions selected in an [interspectrum] concept: spectral moments, standard deviation, peak distribution, central frequency. The interspectral matrix can be obtained by various operators: read_inte_spec [:external:ref:`U4.36.01 `], calc_inte_spec [:external:ref:`U4.36.03 `], defi_inte_spec [:external:ref:`U4.36.02 `], dyna_alea_modal [:external:ref:`U4.53.22 `], DYNA_SPEC_MODAL [], [:external:ref:`U4.53.23 `], or REST_SPEC_PHYS [:external:ref:`U4.63.22 `]. Refer to [:external:ref:`R7.10.01 `] for the description of the treatments performed. This operator produces a table_sdaster table that can be printed by IMPR_TABLE [:external:ref:`U4.91.03 `].