Difference between JC BVRI colour and S-corrections for NOT/ALFOSC (black), LT/RATCam (red), CA-2.2 m/CAFOS (blue), TNG/LRS (green), AS-1.82 m/AFOSC (yellow), and AS-Schmidt (magenta), and difference between 2MASS JHK colour and S-corrections for NOT/NOTCAM (black), TCS/CAIN (red), CA-3.5 m/O2000 (blue), TNG/NICS (green), WHT/LIRIS (yellow), and UKIRT/WFCAM (magenta). Results based on extrapolated 2MASS S-corrections are shown as dotted lines.