Questions about GSADF and BASDF test's parameters

I’m in great need for help and I’ll greatly appreciate any answer. I’m trying to implement those tests in RStudio, but the program tutorial asks among various things to input parameters such as "r0", "r1" and "r2". What do they correspond to? Is it possible they are just default that I’m not supposed to edit? I’m sending a link to the tutorial just in case: https://rdrr.io/github/itamarcaspi/rtadfr/src/R/rtadfUtils.R