This is 55 frames of 16 min NII processed with PI. 12 MB
http://d1355990.i49.quadrahosting.co..._55F_NII_L.jpg
I had the advantage that the final stack was 32 bit floating point. This means any mathematical manipulation such as HDRMT is far more accurate and thus meaningful.
If anyone would like to play with the final 32 bit stack I can put it up, It is only a 150MB fit!
Bert