Other stress smoothing methods
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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 <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 <U4.81.06>`] command.