I understand that the "steepness" of a curve determines how "contrasty" a film is. How do I relate relative log exposure in a characteristic curve to exposure latitude (i.e. the "brightness range" in stops) of a film? For example in the curve of PanF+ I can see that the toe only starts at 1.5 and the straight line at 2 and there is (almost) no shoulder before a density of 2.0. Based on my experience this is a contrasty film that requires very careful exposure, and I can see that on the graph. The curve of FP4+ has a toe starting at 1.0 and an obvious shoulder at 3.5. From my experience, I know that this is a film that can hold a lot of detail in the highlights that can be recovered, and it is forgiving of any errors in exposure. How from the graphs can I tell how many stops I've got? Also, is 1.0 density on the curve where an averaging meter would place the the mid-grey? So the graph shows me how many stops I have for shadows and highlights too? Thanks!