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Fig. 6.
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SEDs of four counterparts of X-1, X-18, and X-24 (from top to bottom). The power-law and blackbody models for ULXs X-1, X-18, and X-24 are shown with dashed red, blue, and green lines, respectively. All data are shown with filled black circles. The data errors, taken as a systematic 0.05 mag, match the symbol size.
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