Near-infrared/optical diagnostic from Rowan-Robinson et al. (2005), representing r–i bands vs. log(Fr/F3.6 μm). Dots: SERVS-SWIRE reference population with available r, i, 3.6 μm photometry. Diamonds: CDF-S3 variable sources. Squares: CDF-S4 variable sources. Color bar: stellarity index from 0 (red) for galaxies to 1 (blue) for star-like sources.
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