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Fig. A.1

image

Two calibrators, C1 and C2, used to calibrate the VEGA/CHARA data of δ Cep are compared in terms of transfer functions with six other calibrators, C3 to C8 (listed in Table 2), on six different nights during 2008 and 2009. The consistency between the calibrators, which is shown by a linear fit (black line), is independent of the two-telescope baseline considered, S1S2 or W1W2.

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