A composition and method for the diagnosis of autoimmune hepatitis. The mark positions for at least one marked angular orientation include a tangential offset of at least one detector head. A support member is affixed to the extended handle to provide an additional point of support so the portable shop light with extended handle may be positioned in a self-stabilized and freestanding manner. The optimized wafer layout is selected out of the at least two wafer layouts depending on the optimization parameter values. Means for reducing fluctuations in the pressure andor flow rate of reformate flowing from the fuel processor to the purification unit are also disclosed.