Figure 5. In XSPEC, using ‘steppar’ command to search the best fit for 20 values of a∗ from 0.8 to 1 for Model 1–4. The black, blue, red, and green solid lines are used to represent the results obtained from Model 1, 2, 3, and 4 successively. The 68 per cent, 90 per cent, and 99 per cent confidence intervals are indicated by the grey lines.
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