Chandra X-ray images of Terzan 5. Left: exposure-corrected, combined Chandra X-ray image of Terzan 5 in the band 0.5–7 keV. The small and large green circles show the half-light radius (0.72 arcmin) and five times the half-light radius (3.60 arcmin), respectively, centered at RA=17:48:04.80, Dec=−24:46:45 (Harris 1996, 2010 edition). Right: region of interest and the spectral extraction regions of observation 3798 for an example. See the region definitions in Sect. 2.4. The outer square shows the FoV of the observation, while the regions of the four annuli within the FoV (ring numbers annotated) show the spectral extraction areas. Ring 4 was used to extract the Terzan 5 background and is marked with a dashed circle. The X-ray image is generated in the band 0.5–7 keV with smoothed 0.492-arcsecond pixels. North is up, and east is to the left.