A two-piece cylindrical telescopic canning sleeve comprising an inner lower member and an upper outer member. The multilayer optical films have an ordered arrangement of layers of two or more materials having particular layer thicknesses and a prescribed layer thickness gradient throughout the multilayer optical stack. The present invention also provides a process for the preparation of the compounds of formula I. The central station composes and edits the music data according to the composing data inputted by the plurality of the information processing terminals to thereby collaborate the plurality of the information processing terminals for creating the music composition. Other embodiments are disclosed. Further, in at least one embodiment of the method, there is volume rendering or ray casting such that only the voxel values of those voxels that lie on the inner surface, in the volume, or on the outer surface of the wall of the treated atrium are used for visualizing at least the section of the wall of the treated atrium of the heart.