In reply to Kristofer.

Thanks for your comment. "n=10" refers to the case where there are 10 dice. When you role 10 dice, the probability that the sum is 10 corresponds to the case where all 10 dice show '1' on their face. As I say in the article, "The sums 10 and 60 appear rarely." The exact probability that Sum=10 is 1 / 6^10 = 1.69E-10, which is indistinguishable from 0 on the plot.