Erratum: Atmospheric characterization of the ultra-hot Jupiter MASCARA-2b/KELT-20b: Detection of Ca II, Fe II, Na I, and the Balmer series of H (H α, H β, and H γ) with high-dispersion transit spectroscopy (Astronomy and Astrophysics (2019) 628 (A9) DOI: 10.1051/0004-6361/201935623)

The original article has two errors which are corrected below and which do not have any impact on the conclusions. 1. In Fig. 7 of the original article, the labels inside the plot are inverted. The corrected figure is shown in Fig. 1. 2. There was an error in the constant value used for the conversion between the standard deviation (-) and the full width at half maximum (FWHM) when fitting the exoplanet atmospheric absorption with a Gaussian profile. As a result, all of the FWHM values shown in the original article change by a constant value. The affected tables and figures from the main text are those containing FWHM information, that is to say, Tables 4, 5, and Fig. 13. In the appendix, this affects Table B.1 and all corner plots from Appendix D (Figs. D.1 D.7). The corrected tables and figures are presented below in the same order as in the original article. (Table Presented).