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Table 2

Calibrators used for the observations.

Calibrator m V m K Spec. type θ UD γ
(mas) (°)

FF Aql
HD 172169 6.7 4.1 K4III 0.942 ± 0.012 13.1
HD 169113 7.1 3.9 K1III 0.816 ± 0.011 13.3
HD 187193 6.0 3.9 K0II-III 0.893 ± 0.012 14.0

T Vul
HD 198330 7.3 3.8 K4III 0.913 ± 0.012 2.6
HD 201051 6.1 4.0 K0II-III 0.827 ± 0.011 3.6
HD 192944 5.3 3.0 G8III 1.085 ± 0.015 8.5
HD 187193 6.0 3.9 K0II-III 0.893 ± 0.012 14.5

Notes. mV,mK: magnitudes in V and K bands; θUD: uniform disk angular diameter in K band; γ: angular distance to the Cepheid.

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