Comparison of five T_eff determinations for the AGB star sample. Symbols and shading are the same as Fig. 8, except for the addition of the L16 temperatures (L16 did not study RGB stars). Three stars are highlighted with labels: AGB star 97 was the subject of our δFe tests (Fig. 7), whilst A22 and A52 have uncertain IRFM and (V−K)T_eff due to suspect 2MASS K magnitudes. These latter two stars have not been included in the linear regression lines for (V−K) or IRFM, and we adopt the (B−V) temperatures for them.