Generation of an electronic document which leaves density difference information between the background of a document and a correcting liquid applied surface is in demand. The surface of the silicon layer is cleaned, to remove foreign material generated on the surface of the silicon layer during the epitaxial growth. At least one of the upstream server and a controller of the mobile device is operative to estimate a location of a user stay of the mobile device, access a database of POIs, and parameters of the POIs, and generate a ranking score for a plurality of POIs based on a weighted comparison of each of the parameters of the POIs with corresponding parameters of the user stay. One embodiment includes spring preloading of the electrical connecter relative to the housing. The pins are arranged in a semi-circular pattern, said sensor housing having a stem aperture and cylindrical wall. The formula is recorded by a controller system.