Fig. 1.

NuSTAR FPMA+FPMB exposure-corrected images combined for the two observations of the field around 1E 1547.0–5408 over the 3–10 keV (left-hand panel) and 10–79 keV (right-hand panel) energy bands. North is up, East to the left. The roll angles were 208.3° and 162.8° for the first and the second observation, respectively, measured from North towards East. Both images were smoothed with a Gaussian filter with a kernel radius of 3 pixels (one NuSTAR FPM pixel corresponds to about 2.46 arcsec), and the same color code was applied to both cases. The green circle indicates the extraction region adopted to collect the source counts, while the dashed white circle marks an example of an extraction region used to estimate the background level (see the text for details).
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