Provided is a cathode active material having a composition represented by the following Formula I: LiFe wherein a molar fraction of phosphorus is in the range of 0. The receiver system includes a receiver device configured to receive the hierarchically modulated signal, which is a function of a time domain, and including a high priority data stream that has a single carrier type modulation, and a low priority data stream having data bits that are spread over a plurality of data symbols of a high priority data modulation. The area of the drive transistor projected onto the fluid ejection surface is less than 37 times the area of the aperture of the nozzle. The image pickup lens includes, in order from its object side, a first lens element having a negative refracting power, a second lens element having positive refracting power, a stop, a third lens element having a negative refractive power and a fourth lens element having positive refracting power, and satisfies the following conditions and . The psychophysical methodologies that may be used with the invention include visual acuity tests and color-matching tests.