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