tess_linn,

To line up your two images as I described in my last post hold down the shift key as you drag one image onto the other, not the ctrl key as I  wrote.  I didn't have Photoshop open when I replied and got the two keys mixed up.  Also if you aren't familiar with the Extract tool yet (Filter>Extract) read up on it as it is a good selection tool that will help with cutting your images up, especially the flats image.

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