Image Details
Caption: Figure 4.
The evolution of spectral index αX and intrinsic absorption column density NH,int. The blue (yellow) points in the upper panel represent the best-fit spectral indices in the time-resolved spectral fittings with fixed (free) NH,int. The yellow points in the lower panels correspond to the best-fit NH,int. The two blue dotted–dashed horizontal lines mark the best-fit intrinsic absorption column density NH,int1 and NH,int2 obtained from time-integrated spectral fittings, respectively. The red dotted–dashed horizontal line denotes the Galactic absorption column density NH,gal. All error bars on data points represent their 1σ confidence level.
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