Open Access
Erratum
This article is an erratum for:
[https://doi.org/10.1051/0004-6361/201833685]


Issue
A&A
Volume 626, June 2019
Article Number C1
Number of page(s) 1
Section Astronomical instrumentation
DOI https://doi.org/10.1051/0004-6361/201833685e
Published online 10 June 2019

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:”

[ X norm Y norm ] [ k ] = [ A norm B norm + C norm D norm A norm + B norm C norm D norm ] [ k ] = [ 1 1 1 1 1 1 1 1 ] · [ A norm B norm C norm D norm ] [ k ] , where norm { Loc , Glob } . $$ \begin{aligned} \begin{bmatrix} X_\mathrm{norm} \\ Y_\mathrm{norm} \end{bmatrix}[k]&= \begin{bmatrix} A_{\mathrm{norm} }- B_{\mathrm{norm} }+ C_{\mathrm{norm} }- D_{\mathrm{norm} }\\ A_{\mathrm{norm} }+ B_{\mathrm{norm} }- C_{\mathrm{norm} }- D_{\mathrm{norm} }\end{bmatrix}[k] \nonumber \\&= \begin{bmatrix} 1&-1&1&-1\\ 1&1&-1&-1 \end{bmatrix} \cdot \begin{bmatrix} A_{\mathrm{norm} }\\ B_{\mathrm{norm} }\\ C_{\mathrm{norm} }\\ D_{\mathrm{norm} }\end{bmatrix}[k],\nonumber \\&\mathrm{where\ \ norm\ } \in \{{\mathrm{Loc} },\ {\mathrm{Glob} }\}. \end{aligned} $$(4)


© V. Deo et al. 2019

Licence Creative CommonsOpen Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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