Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:In the upper Beni basin, the reaches with maximum steepness and concavity values result in erosional unloading over a ca. 20- km-long spatial scale (Safran et al. 2005; Blodgett and Isacks 2007).
Category: