Radial profile of the (NUV − i)_c colours and of the cluster E(B − V) (filled dots) after the application of foreground extinction corrections, with their uncertainties shown as shaded areas. Positive and negative distances trace the northern and southern halves of the field. Different colours represent the profiles obtained by subtracting the Galactic extinction derived from the Schlegel (green), Planck (yellow), FUV 1′ (red), or 20″ (blue) resolution maps. The continuous red line, with error bars, traces the radial profile obtained with no differentiation between the southern and northern halves of the field for the case where the Galactic extinction was derived from the FUV 1′map.