Table 6: RRLSs observed with the 0.8-m telescope in the Xinglong Station.
Variable [Fe/H] $_{\rm Spec}$ [Fe/H] $_{\rm Four}$ $\rm\Delta [Fe/H]$
V452 Oph -1.45 -1.45 0.00
VX Her -1.21 -1.21 0.00
KX Lyr -0.24 -0.21 -0.03
IO Lyr -1.1 -0.96 -0.14
ST Oph -1.02 0.31 -1.33
Notes: [Fe/H] $_{\rm Spec}$ and [Fe/H] $_{\rm Four}$ are [Fe/H] derived from the spectrum
and by the Fourier method, respectively.

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