Table 2: Log of observations (only available online at EDP Sciences).
   
Table 3: Astrometric calibration.
Astrometric Date Scale $\sigma$(Scale) Orientation $\sigma$(Orientation) Corrected stars
standard field   ( $\hbox{$^{\prime\prime}$ }$/px) ( $\hbox{$^{\prime\prime}$ }$/px) ( $\hbox{$^\circ$ }$) ( $\hbox{$^\circ$ }$) HIP Nr

NGC 6611		 17 May 2001 0.499 0.001 0.35 0.01 79492, 83020, 83988/96, 86282,
            87768, 91768/72, 94336, 97241,
            97292, 106694, 110893
NGC 6611 5 June 2001 0.499 0.001 0.21 0.01 54952, 56809, 63253, 65011/12,
            65343, 66492, 67422
NGC 6611 22 August 2002 0.498 0.001 0.39 0.01 473, 2552, 3937, 10531/29, 13642,
            15844, 17666, 17749/50, 18512,
            21088, 66077, 110526, 110640

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