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This article is an erratum for:

Volume 631, November 2019
Article Number C1
Number of page(s) 8
Section Letters to the Editor
Published online 08 November 2019

Following a production error, many arcsecond signs (′′) were replaced with degree signs (°) in the original version of this paper. Here we republish the paper in its entirety, correcting the errors.

© ESO 2019

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