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Not sure Paul. Mega data doesn't equate to a mega result, at least this time. I'm sure the data is fantastic but it could have been handled differently. As Mike highlights there is definitely a gradient. Not sure what techniques you use to 'proof' your work but if you take the jpeg you've uploaded into photoshop - Image | Adjustments | Equalize.
With Equalize, photoshop finds the brightest and darkest values in the image and remaps them so that the brightest value represents white and the darkest value represents black. Photoshop then attempts to equalize the brightness. This will emphasise the gradient making it easier to visualise the direction, colour and helps to check the result after gradient removal has been applied. This will also be contributing to the data being clipped in the shadows. Which you'll see in the lower left of frame. Gradient removal will clean that up (you'll see it histogram too). I didn't realise this was a Ha rich area - is it?
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