There is labelling mistake in Fig. 1 (Sect. 2), as this plot deals with the non-squared visibility: the correct label for the vertical axis should therefore read delta V/V and the inserted texts should be V>40% and V16%. In the body of the article, Sect. 3, another reference is made to this result. The reader should read that the squared visibility limit is V^2>16%. The correction of this mistake does not change the main characteristics of the calibrator stars catalog.