[Ifeffit] Spline range?

Dear all, I am wondering about what range should be chosen in Athena? Some literature says from 1 to the end; some says from 0.5 to the end. Wei -- Wei Li Postdoc researcher Environmental Soil Chemistry Group Delaware Environmental Institute University of Delaware, Newark,19713 Tel:631-949-0663 http://ag.udel.edu/soilchem/li.html http://ag.udel.edu/soilchem/