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ADS1298R VREFM

In the document  "ADS1298RECG-FE ECG Front-End Performance Demonstration Kit User's Guide" (sbau181a.pdf) they talking about VREFM in equation 2 & 3 (page 42) for calculating the DC output and Ib.

What is VREFM, can't find it anywhere in this and others documents. Apparently is 0.1V, but why...