Infrared Hertzsprung–Russel diagram of our sample of 13 targets (orange dots) among the population of field dwarfs (colourful dots) and young and low-gravity objects (grey squares). For reference, we also show a blackbody model (grey line) as well as the AMES-Cond model (blue line) and the AMES-Dusty model (orange line) for the ages of 20 (dotted lines) and 100 Myr (solid lines).