A system for presenting media programming guides is disclosed. The methods and structures include electrical wirings having regions of larger wire cross-sectional areas in locations where the package must supply higher current distribution to the electronic devices andor where signal lines need lower electrical resistance. A computer readable storage medium encoded with computer executable instructions, which, when executed by a processor of a computer, cause the processor to: reduce image artifact caused by differences in variances in projections used to update a voxel of an image for one or more voxels of the image using an iterative statistical reconstruction algorithm. The locking mechanism is moveable between a locked position and an unlocked position.