Fig. 4.

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Persistent spectra of 4U 1730–22. Top panel: preburst persistent spectrum in the energy range 0.3–10 keV and the best-fit models, Tbabs × nthcomp, for burst #5. Bottom panel: red points are the persistent spectrum produced from the observations on top right of HID with the exposure of 256 s, while the black points are from the bottom of HID with the exposure of 800 s. The solid lines are the best-fit models for each spectrum. The same models were used. The black dash-dotted line is the black solid model multiplied by 20. The residuals of the best-fit model to the data are plotted.
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