Left-hand panel: K_s, (J − K_s) SOFI based diagram by Salaris et al. Light symbols display the entire catalogue, while open circles highlight stars with VISIR counterparts. The right-hand panel displays the SOFI VISIR matched K_s, (K_s − N_8.6   μm) diagram. For comparison, the vertical line at (K_s − N_8.6   μm)  =  0.5 marks the location of the majority of MIR-excess stars seen in Fig. 2 of Origlia et al. (2007).