Fig. 3.
Correlation between the measured values of the width (sigma) of the cyclotron line and the X-ray flux. The fit takes into account nine measurements by NuSTAR from 2012 to 2019 (see Table 1). The best-fit line is given by the function sigcyc = (5.30 ± 0.09)+ (0.41 ± 0.07)×((ASM-cts s−1)−5.0) (all values in keV). The Pearson linear correlation coefficient is 0.99.
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