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Description
The RSP models is a variant of the Absorbing Random Walk (ARW) model that is made conditional upon arrival.
So, the first step of the RSP computation is an ARW.
For the ARW: W = Pref * C, where C is the absorbtion rate (e.g. mortality), for the RSP: W = Pref * exp(-theta*C)
So, we can "trick" the RSP into computing the survival probability by entering the mortality/absorption as C = -log(absorption).
This is not ideal, it would be better to add and ARW movement mode where you simply provide C = absorption.
Thus, we might have to rename the "survival" as it is used for the RSP...