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Excellent comments both Kevin and Rex. I thought I was getting a blown core before I did any processing, so I wondered about Kevin's comments until I applied Rex's suggestion about the embedded option. I had been running with the default which certainly was killing the centre right from the begining. So now I have been able to stack my 10 x 30 secs (small in reality I know), and the result (as Rex suggests) is quite dark to begin with. I am a little uncertain whether I am "stretching the mid-tones" when I move the centre triangle in the histogram, but the the core is looking really quite good, however it seems to be at the expense of the background which is getting some dark green noise.
Anyway, thanks guys for the tips. When I get something I'm not embarrassed to put up I will do so.
Bruce
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