Other stress smoothing methods ========================================= There are two other smoothing methods, dealing only with constraints, used by the Zhu-Zienkiewicz estimators version 1 and 2 [:external:ref:`R4.10.01 §3 `]. The constraint fields at the nodes produced are then chamber_no. The corresponding calculation options are accessible by the CALC_ERREUR [:external:ref:`U4.81.06 `] command.