usEstUstarThresholdSingleFw2Binned.Rdestimate the Ustar threshold for single subset, using FW2 algorithm
usEstUstarThresholdSingleFw2Binned(Ust_bins.f, 
    ctrlUstarEst = usControlUstarEst())data.frame with column s NEE_avg and Ust_avg, of Ustar bins
parameter list,
see usControlUstarEst for defaults and description
Demand that threshold is higher than ctrlUstarEst$minNuStarPlateau
records. If fewer records