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Fig. 2

Case of no accretion. Column density (top panel) and α value (bottom panel) as a function of the radius r. Typical variations remains limited, and the α values are below 10-3 and rapidly fall below 3 × 10-4. Note that at small radii (log (r) < −1.6), α increases to high values because of the low resolution.
This figure is made of several images, please see below:
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