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If it helps, I've just run my recent NGC104 through some star ADU counts.
If I scatter plot my blue (y) vs red (x) ADU counts I get a fair amount of spread representing the different star colours. But doing the same with the blue and red fits you uploaded look pretty much identical - so it looks like the same channel has been captured in both.
For globular clusters I set the exposure times in each channel so that the brightest stars at the centre are close to, but not over, the full well levels of the camera pixels.
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