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