Total S/N of the 21cm–LAE cross-power spectrum in the MHDEC reionisation scenario as a function of survey FoV and the minimum Lyman-α luminosity, L_α^min, shown for spectroscopic (left), grism (centre) and photometric-like (right) surveys at z = 7. The 21cm signal noise was computed assuming the SKA-Low1 AA4 antenna layout and a moderate foreground model. Black stars mark potential LAE surveys at z ≃ 7 that could be cross-correlated with SKA 21cm data (see also Table 1).