In processing {TAIL ~ the test spectrum}, background reduction, normalization and {HEAD ~ alignment} of the test spectrum may be performed to better match the test spectrum with the group of class labeled spectra, which have been processed in the same or similar manner 
In processing
In processing { TAIL ~ the test spectrum } , background reduction , normalization and { HEAD ~ alignment } of the test spectrum may be performed to better match the test spectrum with the group of class labeled spectra , which have been processed in the same or similar manner
REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH