I registered and stacked the data with PixInsight. Also stretched with PI.
Large image here 9MB
http://d1355990.i49.quadrahosting.co...SNR_PI_INV.jpg
PI does a much better job of eliminating noise than anything I have used so far.
I have four deep contiguous panels of NII, OIII and SII of the Vela SNR. I will process them when I can and show the result.
Bert