Flux densities of T-ReCS-detected sources in both T-ReCS and Spitzer/IRAC data. Secure detections are indicated by points connected by solid lines; 3σ upper limits are indicated by symbols connected to the other data by dotted lines. As we obtained only a partial image for MIR 3 at 18.3 μm, its flux density is at least twice the indicated lower limit. Error bars are 1σ noise values, but the calibration uncertainty is ±15% for these data after allowing for subtraction of variable background emission.