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A quick example of what it provides, for some reason at least on my system the tilt and curvature numbers go off the edge of the image and are a little hard to read.
You can see from this that my ED72 is just about spot on tilt wise and in this case, field curvature is not too bad, but the edges are actually in better focus than the middle. The SCT however has a lot more curvature and some more tilt, in this case more than anything else caused by collimation needing a touch up. My guilder is not rigid enough either which I think is the cause of most of the tilt that there is in the ED72 image.
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