Radial dependence of the surface flux (1–7 keV) above the NXB for four of the six GCs considered in this study (as labeled in the individual figures). The different colors and markers show the measured surface flux (crosses, black) and the predictions based on an IC model (squares, magenta), a model assuming the same luminosity as Terzan 5 (stars, red) and a model assuming a connection to msPSRs (triangles, blue). The drawn uncertainties are the same as given in Table 3.