Structure parameters of LHS 1140 b compatible with the error bars (see Fig. 13, top panel) computed with the DROP code, assuming a two-layer, IW planet in three rotational states. The colour code refers to values of the core fractional size, which is smaller in the static case than with rotation; see also Fig. 6. Regarding the ocean depth, see Sect. 7.3. As an indication of the break-up velocity (which depends on q), we have reported in the last panel the Keplerian period at the planet equator (red) as well as the period associated with δf = 0.029, which amplitude corresponds to the error bars in the static case; see Eq. (36).