Erratum for: A&A 619, A56 (2018), https://doi.org/10.1051/0004-6361/201833685

An error has occurred during the production of the published article. Before Eq. (4), second column, fourth line, it is written: “Normalized quadrants, either local or global, are”, but it should read “Normalized quadrants, either local or global, are rearranged into measurement terms depending on the PWFS operation method. Conventionally, quad-cell SH-like terms X, Y are used as follows:”

$$\begin{array}{cc}\hfill \left[\begin{array}{c}{X}_{\mathrm{norm}}\\ Y_{\mathrm{norm}}\end{array}\right][k]& =\left[\begin{array}{c}{A}_{\mathrm{norm}}-B_{\mathrm{norm}}+C_{\mathrm{norm}}-D_{\mathrm{norm}}\\ A_{\mathrm{norm}}+B_{\mathrm{norm}}-C_{\mathrm{norm}}-D_{\mathrm{norm}}\end{array}\right][k]\hfill \\ \hfill & =\left[\begin{array}{cccc}1& -1& 1& -1\\ 1& 1& -1& -1\end{array}\right]·\left[\begin{array}{c}{A}_{\mathrm{norm}}\\ B_{\mathrm{norm}}\\ C_{\mathrm{norm}}\\ D_{\mathrm{norm}}\end{array}\right][k],\hfill \\ \hfill & \mathrm{where}\mathrm{norm}\in \{\mathrm{Loc},\mathrm{Glob}\}.\hfill \end{array}$$(4)

© V. Deo et al. 2019