N column on iasp91

Screenshot from 2022-11-25 22-50-22
Hi, I am working with iasp91 velocity model (pictures), and I am wondering what is the mean of the values on the ‘n’ column and how I could compute it for a different velocity model?

Thanks in advance!

I don’t know if that is correct; I interpreted the n column as the number of points for linear interpolation.
For a different velocity model it can be safely ignored.