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Could you make the picture smaller? I think 900 pixels is maximum allowed.

Done. Added link to full-size image, as the detail and noise levels are rather the point.

I've experimented a bit with Dual ISO on my Canon 60D, not with any great success. I am primarily looking to reduce noise in shadows. First time I tried it with a high-contrast area, it had bad sawtooth artefacts in the transition, which I think A1ex subsequently fixed according to a post. I just did a quick test today when out, a shot from within the car on a sunny day. All I see is the reduced resolution, no gain in quality. I would still like to experiment with the method using 2 brackets on a tripod, but I have to change ISO without bumping the camera.
Here's a crop from my experiment using a Canon 60D with Magic Lantern Nightly.2015Jan24.60D111 and Dual ISO set to 100/1600 and decoded using the Mac version of cr2hdr 2.0 Beta

Preview below. Click through to full size in a new tab.