Scale function

[kat-grayson]

Hi, more of a question than an issue but I'm curious what scale function has been used in your implementation. On lines 101/102 you have the threshold function that defines the maximum centroid weight. Comparing this to the paper:

https://arxiv.org/pdf/1903.09921.pdf

your expression is close to the that given in section 5.1 (using the k2 scale function) but, if the definition of Z(n) is what it says in the paper than they're not the same. Can you provide some details on this?

Also thanks so much for the python implementation, great piece of work!