Thanks, Eric. By the way, fantastic images you've been posting. I'm glad you've been getting some clear skies.
Here are images 3 and 4 processed through ppmcentre - cut to 300x300 and qestimator used. In Registax, I used a 95% quality rating (had used 90% for the earlier post). Image 3 is 106 stacked images out of 408 captured, image 4 is 103 images of 387. Wavelets were 4 - 30, 5 - 40, 6 - 50. Even though these were the same settings I used earlier, I felt that more detail was brought out because of the higher quality images.
Comments welcome.