Fig. 1.
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Near-infrared and mid-infrared light curves of the four FUor candidates. We show the light curves from Ks (green), W1 (light green), and W2 (orange) bands (Minniti et al. 2010; Mainzer et al. 2014; Schlafly et al. 2019; Meisner et al. 2023). The vertical red and blue lines mark the dates of spectroscopic observations presented in this paper and Guo et al. (2024a).
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