A method for more securely entering credit card numbers into online databases. The male panel section has an edge with protruding wings, and edge tabs are formed along the edge portion inboard of the wings. A feedback equalization unit is coupled to the slicer to apply equalization to the symbol fed to the slicer input based on prior detected symbol states. Gravity fed bins store empty vials and caps. The size of the bounding rectangle may be specific to each source image, or, conversely, a common bounding rectangle may be used for a group of source images. A composite difference of the time differences is totaled.