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Fig. 1
DFOSC V filter image, taken on 2008-08-03, showing the position of UM673 and the stars “R”, “S”, “T”, “U”, and “V” used to search for a suitable reference star. The “V” star was finally chosen. “G1” and “G2” are field galaxies. The inset zoom shows the two components “A” and “B” of the lensed quasar.
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