**Table 2:** Characteristics of the stars that were used as calibration stars for our VLTI/VINCI observations of $\gamma$ Sagittae. Listed are the spectral type, the K-band magnitude, the uniform-disc diameter and its error, and the effective temperature, all from Bordé et al. (2002; based on Cohen et al. 1999).
Star	Sp. type	K	$\Theta_{\rm UD}$	$\sigma(\Theta)$	$T_{\rm eff}$
56 Aql	K5 III	1.76	2.45	0.028	4046
31 Ori	K5 III	0.90	3.56	0.057	4046
58 Hya	K2.5 IIIb	1.13	3.13	0.035	4318
66 Aql	K5 III	1.76	2.37	0.030	4046
70 Aql	K5 II	1.21	3.18	0.037	4064
$\theta$ Cen	K0-IIIb	-0.26	5.32	0.058	4656
$\phi^1$ Aqr	K1-III	1.79	2.18	0.025	4508
$\lambda$ Gru	K3 III	1.44	2.64	0.030	4256
$\lambda$ Sgr	K1 IIIb	0.40	4.13	0.047	4508
$\pi^2$ Ori	K0 IIIb	1.69	2.14	0.023	4656
$\chi$ Phe	K5 III	1.52	2.69	0.032	4046

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