Fig. 5
Hardness-intensity diagram of all the available PCA observation of RX J0440.9 + 4431. Different symbols refer to different outbursts: diamonds are for the outburst in April 2010 (MJD 55 292–55 301), stars for the outburst of September 2010 (MJD 55 447–55 450), and black dots for the outburst of February 2011 (MJD 55 594–55 606).
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