Fig. 4

PGD refinement (itPGDrel-ref): iterative refinement of the PGD solution (discretization and mode truncation) at the current \(\varvec{\mu }_{h_{it}}\)
PGD refinement (itPGDrel-ref): iterative refinement of the PGD solution (discretization and mode truncation) at the current \(\varvec{\mu }_{h_{it}}\)