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Fig. 6

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MAD positional RMS (× ), calculated over all frames as a function of the corresponding 2MASS K-magnitude for both the higher order correction (blue) and the basic distortion correction (black). The left panels show the data of the NGC 6388 cluster, which was observed with the full MCAO mode for the x- and y-direction, and the right panels show the data of the 47 Tuc cluster, observed with ground layer correction. For comparison, the position precision calculated from photon statistics as the median of all frames is also shown (◇).

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