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Fig. 2

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The light curve of IGR J12580+0134 observed in the 17.3−80 keV energy band by INTEGRAL/ISGRI (red points) and in the 2–20 keV band by MAXI (blue points). The arrow shows an upper limit. Red short-dash line indicates the 5σ upper limit of the source observed by IBIS/ISGRI before 2011. Red long-dash line shows an upper limit observed by Einstein (Fabbiano et al. 1992) and interpolated to 17.3–80 keV. The interpolation is based on the model fitted to the XMM-Newton/INTEGRAL observation. The interpolated Einstein flux is very likely overestimated because of the harder spectrum observed in 2011.

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