Described herein is a process for objectively and automatically determining spectral endmembers and transforming Spectral Mixture Analysis from a widely used research technique into a user-friendly tool that can support the needs of all types of remote sensing. One of the nut selection strips has the same color as at least a portion of at least one of the nut driver handle, the nut driver shank and the nut driver socket. Data mining through an IF utility can aid reverse engineering by constructing a data and code flow analysis after an execution of a program. A low-order current source cell unit includes low-order current source cells weighted to generate constant currents having current values that differ by a predetermined proportion of a current value of the constant current generated by the high-order current source cell. The antenna resonating element may be formed from a peripheral conductive electronic device housing structure that is separated from the antenna ground by an opening.