Looks for NAs in a lfobj.
An object of class "lfobj"
A list with the total number of NAs, the percentage, the NAs for every year and the durations of NA-series.
Daniel Koffler and Gregor Laaha
Gustard, A. & Demuth, S. (2009) (Eds) Manual on Low-flow Estimation and Prediction. Operational Hydrology Report No. 50, WMO-No. 1029, 136p.