Fig. 2
Centroid energy E1 (top panel) and width σ1 (bottom panel) of the fundamental CRSF as a function of the 3–100 keV X-ray luminosity. Red points correspond to the 2015 outburst, blue points to the 2004–2005 outburst based on SPI data, and cyan points to the 2004–2005 outburst based on IBIS data. Black lines show the linear fit. The error bars represent the 68% confidence intervals.
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