Methods and apparatus are described for sensing misplacement of an optical sensor on a patient. The engine unit includes a cylinder block, an intake manifold, and fuel injectors. The method may further include deconvolving the shape of the glass sheet into at least one simple shape element, such as cylindrical or spherical, and may further include varying the temperature profile of an array of heaters in a glass manufacturing process based on the at least one shape element. For example, when the Bluetooth interface detects interference levels above acceptable thresholds, the Wi-Fi interface adjusts operation of one or more of its transmit chains based on various conditions such as duty cycle, Received Signal Strength Indication, etc. The leg has an outer surface with a sealing band that is spaced from the backseat seal surface during normal operation of the valve. The device comprises means for drawing the atmospheric air into the device; means for condensing the moisture vapour in the atmospheric air into water, and means for collecting the water.