A toroidal transformer enclosure is disclosed. The sliding cover has solar modules and a size surpassing at least in the direction of width of the sliding cover the size of the roof opening so that as many of the solar modules as possible can be attached to at least one side of the sliding cover. 95 gm3, changes of said formation index and density of said base paper before and after contact of a front surface of said base paper at a side on which an image recording layer of said imager recording material is formed with water at 20\xb0 C. Entries in the user’s list are compared with entries in the other users’ lists.