Deezer company also introduced two subscription services—users paying €4.99 monthly received higher-quality music without ads, and users paying €9.99 monthly gained access to downloadable applications for computers, as well as Android, BlackBerry, and iOS mobile devices. In January 2010, the company's CEO and co-founder, Jonathan Benassaya, was replaced as CEO by Axel Dauchez, after fewer than 15,000 of Deezer's 12 million users signed up for its subscription services. In August 2010, mobile operator Orange partnered with Deezer in a deal to include free access to Deezer Premium, the highest tier of Deezer's streaming packages, with some of Orange's telecommunications contracts in
Tidal prism not as great as in shallower estuaries creating a smaller tidal prism and a longer residence time. The size of an inlet or estuary is determined, according to O’Brien by tidal prism. Tidal prism magnitude can be calculated by multiplying the area of the estuary by the tidal range of that estuary. During spring or fall tides, when sea level is relatively high and floods backbarrier areas that are normally above tidal inundation, the cross sectional area at the entrance of the estuary increases as tidal prism increases. Since tidal prism is largely a function of area of open water