By combining NDIS experiment and EPSR simulation we have been able to show with a previous experiment (RB 720500) two main phenomena for water confined in the MCM silica matrix. First, at 210 K water expands within the pore occupying more homogeneously, compared to room temperature, the available volume. Secondly, the microscopic structure of water changes into a more open and tetrahedral structure which is consistent with a density decrease, and consequently with the recently reported density minimim at 210 K of confined water. We propose to study the temperature dependence of the microscopic arrangement of confined water molecules, by extending the previous experiment to other temperatures in the range 190 - 260 K.