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:The masses presented in Table 3 are averages for several specimens, but in this analysis Arctodus simus is represented by the specimen PM 24880, one of the largest and most complete specimens known (Richards & Turnbull 1995). If one takes the average value of the six means calculated for this particular animal from the total sample, the result is a mass of 780 kg, very close to the 766 kg calculated for the specimen by Richards and Turnbull (1995). The corresponding values for the regressions for felids and ursids are 822, and no less than 1 039 kg, respectively.
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