Table 1: Calibrators used for the observations. "SP'' stands for spectral type. Uniform Disk diameters, given in mas, are only intended for computing the expected squared visibility in the K band.
  SP UD diam. Baseline Notes
HD 5848 K2 II-III $2.440_{\pm0.064}$ S1-S2 B02, 1
HD 5848 K2 II-III $2.440_{\pm0.064}$ E1-E2 B02, 1
HD 81817 K3 III $3.260_{\pm0.085}$ - -
HD 139669 K5 III $2.890_{\pm0.035}$ - -
HD 222404 K1 III-IV $3.290_{\pm0.051}$ - -
HD 83550 K2 III $1.160_{\pm0.015}$ W2-E2 M05, 1
HD 91190 K0 III $1.330_{\pm0.018}$ - -
HD 118904 K2 III $1.411_{\pm0.018}$ - -
HD 176527 K2 III $1.721_{\pm0.024}$ - M05, 2
HD 218452 K5 III $2.080_{\pm0.024}$ - -
HD 162211 K2 III $1.598_{\pm0.020}$ S2-W2 M05, 2
HD 165760 G8 III $1.500_{\pm0.020}$ - -
HD 207130 K1 III $1.331_{\pm0.017}$ - -
HD 217673 K1 II $1.411_{\pm0.020}$ - -
HD 9022 K3 III $1.050_{\pm0.014}$ W1-E2 M05, 1
HD 42855 K3 III $0.803_{\pm0.010}$ - -
HD 217673 K1 II $1.411_{\pm0.020}$ - -
HD 206842 K1 III $1.214_{\pm0.016}$ - M05, 2
Notes: B02 refers to Bordé et al. (2002) catalog; M05 to Mérand et al. (2005a) catalog;
1 refers to Polaris observations and 2 refers to $\delta $ Cep ones.

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