Table 6: Results of PCA for Sample 2.
Set Principal Component Eigen value Cumulative $\%$
S1( $R_{\rm gc}, M_{V}, R_{\rm c}$) 1 1.4 47.7
  2 1.0 80.6
  3 0.6 100.00
S2( $R_{\rm gc}, M_{V}, c$) 1 1.3 44.5
  2 1.0 78.2
  3 0.7 100.00
S3( $R_{\rm gc},B-V,c$) 1 1.5 48.8
  2 1.0 81.8
  3 0.5 100.0
S4( $B-V,c,R_{\rm c}$) 1 2.1 71.0
  2 0.7 94.0
  3 0.2 100.0
S5( $R_{\rm gc}, M_{V}, c, R_{\rm c}$) 1 1.9 46.5
  2 1.3 79.9
  3 0.6 96.3
  4 0.2 100.0
S6( $M_V,c,R_{\rm c}$) 1 1.8 60.5
  2 1.0 93.9
  3 0.2 100.0
S7([Fe/H], $c,R_{\rm c}$) 1 1.9 62.7
  2 1.0 94.4
  3 0.2 100.0


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