When there is an image that contains a nice sharp impact crater of x diameter it would seem easy to mark the 'rim' at the well defined raised feature directly surrounding the bowl. But there are times where if you look closely you can see a faint ring located some 3 to 8 x distance out from the defined crater. Usually the surface texture is very slightly smoother or just different in appearance within this faint larger ringed area. I have already looked through the tutorial, FAQs, and glossary images, but unless I just plain missed it I have not found a definitive answer for which we should be marking as the actual 'rim' feature. Especially where the sharp inner crater is below the minimum marking size but the surrounding outer ring is well over the cutoff diameter.
Should I just mark both features as concentric craters?
Next. If I 'loose' an image for some reason before I click the Done Working button, is anything saved at your end or is it plain gone?