The coefficients for the wetday-precip relationship were developed based on the wetfrac30m_t0.2_202512.nc file, i.e., wetdays threshholded to a 0.2mm/day minimum to count as a wet day.
The coefficients are calculated in R using lmfit <- lm(dep ~ log(ind)) where dep is observed wet day fraction and
ind ind is total monthly precip.