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Fig. A.1

Triple-Gaussian fit of the 1835 GHz OH triplet (blue line, from Fig. 2): blueshifted (light blue line), ambient (pink line), redshifted (grey line) components, and total fit (black line). The vertical dashed line is at the cloud νlsr of − 11.2 km s-1 (Narayanan & Walker 1996; Gómez et al. 1999).
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