Notes. (1) Model (see Table 3), (2) abbreviation of the telescope name: Ch stands for Chandra, while Nu for NuSTAR (FPMA and FPMB are indicated in parentheses), respectively. For Chandra observations, the radius of the source extraction region is specified in parentheses. (3) Cross-calibration constant, (4) intrinsic hydrogen column density, (5–6) photon index and normalization of the power-law emission component, (7–8) energy and normalization of the Gaussian component, where the corresponding equivalent width (EW) is reported in parentheses, (9–10) temperature and normalization of the collisionally ionized thermal plasma, (11–12) temperature and normalization of the second collisionally ionized thermal plasma, (13) ratio of the χ² fitting statistics to degrees of freedom. For clarity, we split analyses that were performed individually (top panel) from those in which the data taken with different instruments were fitted simultaneously (bottom panel). The models include Galactic hydrogen column density N_H,  Gal = 1.86 × 10²⁰ cm⁻² and thermal component assumes solar abundance. For the Gaussian component, the σ was set fixed to 10 eV. Values without errors were set fixed during the fit. The normalizations are ph keV⁻¹ cm⁻² s⁻¹ at 1 keV for the power-law component, , assuming uniform ionized plasma with electron and H number densities n_e and n_H, respectively, and volume V, all in cgs units, for the thermal component, and total number of ph cm⁻² s⁻¹ in the line for the Gaussian component.