Fig. 1
True-color image of the young cluster NGC 1893. A kernel smoothing has been applied to highlight point sources. The energy bands of the RGB image are 0.5–1.1, 1.1–1.9, and 1.9–8.0 kev for red, green, and blue colors. Brightness is scaled to the logarithm of the photon number in the displayed pixel. The color model depicts zero flux as black.
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