Thanks all for the feedback. I should not process after being up all night. The image is far to noisy. The 30s data modulated the far less noisy 4m data. I think I fixed it.
Here is just the 30sec data 6MB
http://d1355990.i49.quadrahosting.co...11/M42_30s.jpg
This is a better version of the 30s and 4min data together 7MB
http://d1355990.i49.quadrahosting.co...11/M42_hdN.jpg
The images below are a 100% crops from the 30s data image at native and upsized X1.5 to show the Trapezium.
Bert