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Fig. 2.


Fields monitored toward the LMC: EROS 1 plate (large red square), MACHO fields used to measure the optical depth (Alcock & MACHO 2000, blue squares), EROS-2 (black rectangles), and OGLE-III (green squares). Red dots show the positions of (a fraction) the OGLE-IV field centers. The gray field contains catalog 1, which has been observed for 27 years. The orange and gray field covers catalog 2, which has been observed for 25 years. Catalog 3 is contained in the light yellow, orange, and gray field, and it has been observed for 21 years. Finally, the combination of all the colored fields contains catalog 4, which has been observed for 16 years.

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