May not be perfect, but place a piece of masking tape onto each of the two limbs, just at the end of the fade outs, and just large enough to mark on.
Measure, or eyeball if you have good depth perception, the middle of each limb ( width ) and mark. Now run a string line or a flexible ruler from one to the other and take a peek at the line as compared to what is cut. Remember that the riser is probably at least slightly radiused ( not flat) so you need to take a good look at it to be close.
That should give you a pretty good idea of how your bow is set up.
CHuckC