Here is version two at native size 6MB. I may have pushed things to far but as they say nothing ventured nothing gained. I used all the data.
http://d1355990.i49.quadrahosting.co...10/M8J_10n.jpg
Version two at twice native size 15MB
http://d1355990.i49.quadrahosting.co..._10/M8J_10.jpg
Next version I will try star reduction selectively to RGB individually to minimise the very slight colour haloes before registering and combining.
I have added the three original images used to generate the tone mapped image.
Bert