highly significantP < 0.001
3 Results 3.1 Calibration of the proposed methodologies using possum fur A scatterplot matrix ( Fig 3 ) showed that the results obtained by both testing methods (DGI and PIP methods) were comparable, as indicated by a highly significant ( P < 0.001) linear relation between the two measurements: L PIP = 1.72 + 0.89 × L DGI (r 2 = 0.84).