Fig. 1

JHK 2MASS PSC vs. NTT and TNG JHK magnitudes. In the plots, the solid line mark the 1:1 relationship and the dotted horizontal lines the 2MASS PSC 10-σ limiting magnitudes J = 15.8 mag, H = 15.1 mag, and Ks = 14.3 mag Sources above these lines are detected below the 10-σ. The error bars have not been plotted as they are in most cases smaller than the data points.
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