Median period from their individual light curves and calculated Δ_LS For all the 1950 M dwarf stars in the sample (left). Higher values of Δ_LS indicate a greater spread in the values of the period over the sectors in which they were determined. The colours of the points indicate how many sectors of data were analysed. The same distribution but for the 1432 stars in our solar-like sample is shown on the right.