Fig. 1
Sketch of the areas covered by the main optical, infrared, and X-ray surveys in the region of Collinder 69. λ Ori itself is highlighted with a large star and the B population with smaller ones. Omega 2000 and Ingrid data together fill the area covered by the CFHT survey (we do not include the mosaics for the sake of clarity in the figure). The large red dashed boxes show the IRAC FoV – the edges are the regions with coverage only in 3.6/5.8 or 4.5/8.0 – and the area surveyed by MIPS is slightly larger.
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