ProcesSet.Usage
attachData(object, treenames = character(0), varlist = character(0), outfile = "data.txt")
removeData(object)
"ProcesSet".ProcesSet object.
attachData exports varlist from tree(s) with treenames and and saves the result
as data.frame in slot data. Possible values of parameter varlist are described
in export. removeData removes data from slot data and replaces data.frame data
with an empty data.frame of dim(0,0).
attachDataXY, attachInten