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:For reference we also include in Table III the results for the scalar field toy model with pure initial data (the s = 0 case) [21,22] (the results for generic initial data coincide with those of gravitational and electromagnetic perturbations).
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