Fig. 2.
Photometric calibration of OMEGA2000 (“O2”) data. Panel a: comparison of calibration diagrams using 2MASS or UKIDSS as the reference (“ref”) survey. Panel b: location of J-band point sources (colored crosses: JUKIDSS < 17; σJ < 0.035) relative to the flat-field artifact, see Sect. 2.1. Panel c: close-up view of panel a showing the J-band bimodality; symbols are as in panel b.
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