To upgrade our product to PHC 2.1, we incorporated select data from BIO's database. Below, illustrated on a blow up of the Archipelago region, are the actual winter value inputs into the optimal interpolation(oi) routine from each of the three data sets. Only winter surface temperature is shown, but they demonstrate where data profiles exist for both temperature and salinity. Many of these profiles do not extend all the way to the ocean floor. Profiles of the BIO data used as inputs into the oi routine appear in the PHC 2.1 Detailed Report.