Fig. 1.
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Sky distribution of the surveyed stars measured with respect to the cluster gravitational centre. Grey points are stars from the HST adopted dataset and the LBT wide-field catalogue by Beccari et al. (2013). The black polygon marks the boundaries of the HST FoV. The golden cross marks the cluster gravitational centre, while the dashed and solid circles correspond to the cluster half mass and tidal radius, respectively.
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