Contour maps of the reduced χ² for the He(2³S) absorption of HD 189733 b. Dotted curves represent the best fits with large symbols denoting the constrained ranges for a confidence level of 95%. Overplotted are also the estimations when including the effects of the stellar winds with a scaled solar wind (see Sect. 3.2, black triangles), and the curve and circles (in black) obtained previously by Lampón et al. (2021b).