Fig. 1
Images of the slit-viewer camera of UVES red-arm showing the crowding of the field. The field of view is approximately 15′′ to 15′′. The black horizontal shadow is the slit opened at 1′′. On the bottom, the target is decentred (top left of the slit). On the left, the position that we chose when the slit is on the target, OGLE-2011-BLG-0417.
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