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The command POST_ENDO_FISS performs post-processing on a result derived from the mechanics of continuous media. The aim is to find the curve that represents the crack from a representative field and the crack opening. The field may be damage or another scalar field. As input, the command uses an evol_noli or cham_gd concept, containing the field to be post-processed. This should be a node field. As output, the command returns a crack mesh (made up of SEG2 elements), as well as a table containing the coordinates of the crack nodes and the value of the aperture on each node. The procedure applies to 2D studies.