Colour–magnitude diagram of the 58 Leo T stars detected with MUSE, plotted against PARSEC isochrones drawn for constant [Fe/H] = −1.6 and variable age. Magnitudes given are on the Vega Magnitude System. The region spanned by 0.1 − 1 Gyr isochrones is shaded in light blue with two representative isochrones shown for 0.2 and 1.0 Gyr. The region spanned by > 5 Gyr isochrones is shown in dark grey shading and a 9 Gyr isochrone is shown for illustration. At the meeting point of the two regions there is an overlap represented by a region shown in darker blue; here there is considerable degeneracy between the isochrones. The stars that were found to be consistent with the younger isochrones are shown as dark green discs, with the emission line stars shown as green squares. The stars consistent with the older isochrones are shown as red crosses.