A B C D E F
A 1.0000 -0.0725 0.2135 0.3806 0.4239 0.2161
B -0.0725 1.0000 -0.3540 -0.1499 -0.2106 0.1555
C 0.2135 -0.3540 1.0000 0.2619 0.1297 -0.2949
D 0.3806 -0.1499 0.2619 1.0000 0.2398 0.2922
E 0.4239 -0.2106 0.1297 0.2398 1.0000 -0.2729
F 0.2161 0.1555 -0.2949 0.2922 -0.2729 1.0000
Table 2: Correlation matrix of the six descriptors used in this work.