contours between 92.2 and 113.3 are both 100 AND 110. If you have spots between 2.1 and 42.2 then your contour lines are 10, 20 30 and 40. Is that what you were asking? I have just completed plate 1 and am busy with plate 2. If the spots are at 32.1 and next is at 31.1 then there is no contours between them. If you search Penn Foster through this site then you will find that there are posts prior to you asking along with diagrams showing how the contours end up. That helped me tremendously.