I'm confused about the description of variable and function

[leslielee619]

https://leapct.readthedocs.io/en/latest/ctgeometries.html#leapctype.tomographicModels.find_tau

Hello，I'm very sorry to disturb you. I have two confusions as follows:

1. In set_conebeam function, the meanings of the variables $$s,t,\hat{z}$$ are not explained.
2. you said "The function find_tau works by minimizing the difference of conjugate rays, by changing the horizontal source position shift (equivalent to rotation stage shifts). "，here "the horizontal source position shift" means source and detector shift simultaneously?