Can someone explain to me what the profile checker figures actually mean?

The checker gives results for

dE, Peak Value, Min Value, and standard deviation

I can come up with two possible interpretations:

1. The statistics reflect how far the *actual* patches on the test shot are from the *generated curve*;

in which case they are a measure of how well the test curve fits the actual test shot.

2. The statistics reflect how far the *corrected* patches on the test shot are from a curve for a theoretically "perfect" target,

in which case they are a measure of how well the test curve actually corrects.

There may be other interpretations.

Can someone tell me what the statistics really are about?

Thanks,

Gary