12. The computer readable storage medium of claim 10 , wherein the program instructions further comprise computer readable code that causes the processor to determine a background expected value of the model search space.
12. The computer readable storage medium of claim 10 , wherein the program instructions further comprise computer readable code that causes the processor to determine a background expected value of the model search space. 13. The computer readable storage medium of claim 12 , wherein the program instructions further comprise computer readable code that causes the processor to determine a spectral fit between the first spectral signature and each spectral signature of a plurality of spectral signatures from the library, wherein each of the spectral fits corresponds to a correlation coefficient between the background suppressed signature and each of the plurality of spectral signatures.