Calibration

I have used T20 and T74 both of which are colour cameras.

With T74 the calibration files are 3-channel which I expected, but with T20 they are single channel. I have been able to achieve reasonable results with T20 using Cosmetic Correction to get rid of hot pixels, but why not provide 3-channel Calibration files like you have with T74. The sing channel bias master for T20 is seriously over-exposed which is really strange as it should be readout noise.