Figure 4

The relative \(\pmb{\mathbf {H}(\mathbf {curl})}\) error vs. the rotation angle for three different choices of \(\pmb{a_{F}}\) and 4 different mesh-sizes: \(\pmb{h=0.638174, 0.482025, 0.359644, 0.261798}\) . Second order edge functions \(R^{2}\) were used for discretization and \(\varepsilon= 10^{-6}\), \(\eta =50\), \(\mu\equiv1\). Note that the curve for \(a_{F}^{(2)}\) is partially hidden by the one of \(a_{F}^{(1)}\).