Contour maps of the reduced χ² for He(2³S) absorption of GJ 3470 b. Dotted curves represent the best fits, with large circles denoting the constrained ranges for a confidence level of 95%. Overplotted are also the curve and symbols for H/He = 98/2 obtained previously by Lampón et al. (2021b), black solid circles, where the label ‘98’ corresponds to the hydrogen percentage. The curves and triangles are the Ṁ–T ranges obtained for H/He = 99.8 when including the effects of SW (see Sect. 3.2) for a fast solar wind (upward triangles, orange) and a scaled stellar wind (downward triangles, black). The black dots represent the grid of the simulations.