A capacitor includes a hollow capacitor element formed by rolling a pair of flat sheet-like electrodes and, with separators interposed therebetween, a bottom-closed metallic casing receiving the capacitor element and a drive electrolyte therein, and an opening-sealing plate sealing an opening portion of the metallic casing, the opening-sealing plate having an external connection terminal. The method comprises providing a set of media channels, providing access, to one or more pre-selected remote users, to usage data regarding consumption of the multimedia content, and selectively restricting access of at least a portion of the usage data to at least a portion of the remote users. An evolved packet system is further provided. A top floater is attached to the top of the outer container. Such a system may include a deployment catheter and an attached imaging hood deployable into an expanded configuration as well as an imaging element, such as a CCD or CMOS imager, which may be deployed from a low profile configuration into a position which is off-axis relative to a longitudinal axis of the deployment catheter andor imaging hood. It is advantageous to operate the PSA process at a pressure comparable to or below the operating pressure of the highest pressure column in the cryogenic separation unit.