An electrical connector is provided and includes a housing that has a mating face configured to engage a mating connector. The methods involve capturing a multicomponent complex on a solid support and washing the support with a series of elution washes forming a gradient of solute concentrations, and determining whether a particular elution wash eluted a particular component. The armature includes arrays of light sources and sensors. Periodically, VAT-related data are aggregated for each of the plurality of countries to generate respective tax return reports. Each of the plurality of gates is positioned at one side of an electron-emitting portion in an arrangement direction in which the plurality of electron-emitting portions are arranged.