Fig. 2.
Spectrum of PSR J1909–3744. The data is represented by crosses from MOS1 (black), MOS2 (red) and pn (green) of PSR J1909–3744. Top plot: data fitted with fixed absorption (tbabs) and a hydrogen atmosphere model (nsatmos, the * model in Table 2, green solid line). Bottom plot: same data divided by the model and shown as residuals, in units σ, which is the error bar of each data point.
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