Furthermore, the embodiments provide a method of reducing {HEAD ~ the condition} of {TAIL ~ the deterministic correlation matrix} used in the least squares method 
Furthermore , the embodiments provide a method of reducing { HEAD ~ the condition } of { TAIL ~ the deterministic correlation matrix } used in the least squares method
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH