Peter,
Quote:
OK...I've done better than that.
This is a link to a mouse-over of the blue versus H-alpha channel data, complete with spelling errors 
As you will see H-alpha (a very deep, but visible red which DSLR's are quite insenstive to) dominates, with many features simply not emitting in blue at all.
Cheers
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Thanks for that Peter,
I can see that the blue is no where near as strong as the red.
It would be interesting to see a different processing with
equal RGB colour graphs using curves in Photoshop -
in other words artifically balanced.