[helioz (Erwin)]

I'm very new to Deep Sky Stacker (and Astro imaging in general).
My question on DSS is this:
Which stacking method produces a sum of the images rather than an average?
I've been stacking 50 wide angle images of the milky way each taken at 30" exposure - total exposure of 25 min. Although the resulting image (see below) provides a lot of detail, it appears that the images are only averaged and not summed.
I would expect the summed image to produce a much brighter milky way than what I get.

Any help or other comments would be greatly appreciated.

Many Thanks

Erwin