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Fig. A.1
Photometry of GJ 504A (blue dots) compared to a BT-NEXTGEN synthetic spectrum (red line) at Teff = 6200 K, log g = 4.5, and M/H = +0.3 scaled in flux. The flux-calibrated INES, STELIB, and SINFONI spectra (yellow, green, and grey lines, respectively) of the star are compatible with the flux-calibrated model-spectrum.
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