External validation of our catalogue (RC-ALL here) by cross-matching against the catalogue of L20, shown on the Kiel diagram using parameters from the latter. We also overplot density contours at (1,2,3)σ, shown in black. The typical crude boundary for RC stars, 1.8< loɡɡ <3.0 is indicated by black dotted lines. Panel (a) shows that the distribution of L20 falls mostly (1,2 σ) inside the crude boundaries, and is also broad in T_eff. Panel (b) shows the crossmatch between L20 and our sample. Nearly all of these overlapping sources lie between the crude boundary, and also display a tighter distribution in log ɡ. Panel (c), finally shows the stars that are present in L20, and are not classified as RC, but are present in our sample. Again, the stellar parameters from L20 for those that lie within the (1,2)σ contour are consistent with expected boundaries, although there are possible contaminants around the region log ɡ>3 and T_eff>5000 K.