A valve assembly including a main body defining a central axis and a gate. A domed device casing is mounted between a pair of floats. Coupling and quantum efficiency of such a LC-DFB laser both improve with an increase of the lateral mode order. The second step comprises clustering the expression pattern data within the designated segment along the second axis based on a predetermined reference value, repeating clustering within the same cluster in a forward or reverse direction along the second axis while changing the reference value, and displaying the results according to a predetermined display format. The composition of the invention is useful as a frit on the window of a vehicle. Metal supported solid oxide fuel cells comprising an anode a cathode and an electrolyte, wherein the anode includes nickel, copper and a rare earth-doped ceria, fuel cell stacks and uses of these fuel cells.