Data characterizing signal propagation times between a mobile user and a plurality of base stations can be received. Generally, the method includes: forming a first layer of the bilayer charge storing layer; and forming a second layer formed on a surface of the first layer, the second layer including an oxynitride charge trapping layer. The heater evaporates at least some liquid droplets in a stream received by the flow body. A switching circuit is turned onoff in accordance with the control signal sent from the decoder circuit and selects and outputs one of the plurality of voltages outputted from the resistor circuit.