tokens: best fit for Model 1 (χ 2 /ν = = 1.02) and Model 2 (χ 2 /ν = = 1.02) yield radii of 2.1 and 5.2 R, respectively. We have also performed another fit letting relxilllp represent both incident and reflected spectra alone (Model 3: diskbb+relxilllp ), in such a way that we can leave the reflection fraction free. The best fit (χ 2 /ν = = 1.02), which sets the inner radius at 1.7 R, provides a reflection fraction of R = 0.26. The power-law index – now unique for both incident and reflected spectrum – is Γ = 1.78. Other parameters, which are common to Models 1 and 2, have not changed much from the values quoted previously. In regard of spin and inclination, Fig. 6 presents the MCMC output distribution for these two parameters for the cases where R in was left free in Models 1, 2, and 3. For all three models, the spin behaviour differs very little from that of relconv(reflionx) , displayed in the bottom panel of Fig. 5 : it reaches the hard limit but is only poorly suggestive it might be ≳ 0.5 (1 σ); any value is still possible within 3 σ. As for the inclinations, they all coincide to be in the range of ∼ 60–85° (2 σ); values below ∼ 55° can be excluded with 3 σ confidence for Models 1 and 2, whereas for Model 3 this same confidence region encompass a broader range, with marginally lower inclinations. Model components, model fitted to the data, and its residuals for Model 2 are displayed in Fig. 7 . Aside from providing the best constraints on spin and inclination, the reason we elect to show this combination is that it includes the comptonization component, in which best-fitting values of τ and kT e are – as formerly discussed – in a more likely interval for 1E 1740.7−2942. For a comprehensive description of the model variables and dependencies, we also present, in Fig. 8 , the joint distributions of selected parameters for Model 2. Figure 6. MCMC output distribution for parameters spin and inclination for combinations relxill+comptt (Model 1; upper panel), relxilllp+comptt (Model 2; middle panel), and relxilllp alone (Model 3; bottom panel). The black plus symbols indicate the best-fitting values. Confidence contours of 1 (magenta), 2 (bluish green), and 3 (blue) σ are shown. The colour figure can be viewed online. Figure 7. Model components (upper panel), model fitted to the data (middle panel), and its residuals (bottom panel) for Model 2. Note: Vertical axis of bottom panel is in (data-model)/error , equivalent to , so magnitudes of XMM (blue), NuSTAR (magenta), and INTEGRAL (bluish green) residuals are comparable. The colour figure can be viewed online. Figure 8. Joint distribution of selected parameters for Model 2, calculated from the MCMC output. The red plus symbols indicate the best-fitting values. Confidence contours of 1 (magenta), 2 (bluish green), and 3 (blue) σ are shown. Note: Parameters and their units are: N H (× 10 22 cm −2 ), T 0 (keV), kT e (keV), h ( R g ), i (degrees), R in (R), (log erg cm s −1 ). τ and a are dimensionless.
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