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Fig. 1.


Fragments of AstraLux fields for 13 of the targets in this paper (two of them with two epochs). The field size, target, evening date (YYMMDD), band, and lucky image frame selection fraction are given in each case (z stands for SDSS z, zn is a narrow-band filter with a similar central wavelength). The intensity scale is logarithmic to show both bright and faint sources. Diamonds are used to mark the last position of the known components in the WDS catalog (if no entry exists there, then an A is used to mark the brightest detected component). Each frame is 4″ × 4″ (160 × 160 pixels) with north up and east left.

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