Table 4: Results of PCA for Sample 1.
Set Principal Component Eigen value Cumulative $\%$
S1( $R_{\rm gc}, M_{V}, R_{\rm c}$) 1 1.6 53.1
  2 0.8 79.9
  3 0.6 100.0
S2( $R_{\rm gc}, M_{V}, c$) 1 1.4 47.3
  2 1.1 82.9
  3 0.5 100.0
S3( $R_{\rm gc},B-V,V_{\rm r}$) 1 1.3 43.7
  2 0.9 75.3
  3 0.7 100.0
S4( $R_{\rm gc}, M_{V}, \mu_{V}$) 1 1.5 51.5
  2 0.9 81.9
  3 0.5 100.0
S5( $R_{\rm gc}, M_{V}, c, R_{\rm c}$) 1 2.0 50.7
  2 0.8 71.3
  3 0.7 88.9
  4 0.4 100.0
S6(MV,c, [Fe/H]) 1 1.6 53.0
  2 0.8 80.0
  3 0.6 100.0
S7( $c,R_{\rm c}$, [Fe/H]) 1 1.6 54.7
  2 0.9 85.7
  3 0.4 100.0
S8(HBR, [Fe/H], c) 1 1.5 49.7
  2 0.9 79.2
  3 0.6 100.0


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