Table 4: Parameters and coefficients of the various linear regressions to the calibrating sample (31 variables in set #1).
The relation SD R
$\rm [Fe/H]=-3.766-5.350{\it P}+1.044\varphi_{31}$ 0.139 0.960
$\rm [Fe/H]= 0.603-5.375{\it P}+0.636\varphi_{41}$ 0.152 0.952
$\rm [Fe/H]=-2.380-5.287{\it P}+1.636\varphi_{21}$ 0.166 0.940
$\rm [Fe/H]=-0.233-4.532{\it P}+0.331\varphi_{51}$ 0.169 0.915
$\rm [Fe/H]=2.100-4.694{\it P}-6.925A_{3}$ 0.196 0.897
$\rm [Fe/H]=2.040-4.866{\it P}-8.399A_{4}$ 0.227 0.860
$\rm [Fe/H]=1.841-4.804{\it P}-9.836A_{5}$ 0.230 0.855
$\rm [Fe/H]=2.140-4.618{\it P}-2.663A_{1}$ 0.232 0.853
$\rm [Fe/H]=1.510-4.342{\it P}-1.954A_{2}$ 0.244 0.820
Notes: The relation is derived from the linear regression to the calibrating sample, where P is period. The $\varphi_{\rm i1}$ is defined as $\varphi_{i1}=\varphi_{i}-{\rm i}\varphi_{1}$, and Ai refers to Eq. (1). SD: standard deviation of the fit. R: correlation coefficient.

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