According to one embodiment, an oscillation layer of a spin torque oscillator for use in a magnetic head includes a stack of first and second metal films. Also provided herein are vectors and host cells comprising those nucleic acid sequences, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptides of the present invention. A demand forecast for a coverage area of a proposed network may also be received. The circuit board has a plurality of signal contacts corresponding to the keys. Compensation circuitry compensates the digital data representative of the image using the information indicative of the locations of the defective pixels.