Fig. 6.
Two-dimensional histograms show the W1 − W2 vs. W2 − W3 (panel a) and the W1 − W2 vs. W3 − W4 (panel b) colour-colour diagrams, and the W1 − W2 vs. W1 − W2 (panel c) colour-magnitude diagram. The IR colours for the entire LDR1 sample for which there is WISE data available (218 595 of 318 520 sources) is the two-dimensional histogram, with contours indicating the 25%, 50%, and 75% levels. The points are the LDR1 sources from our sample for which there is WISE data (96 of 98 sources).
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