Outlines of the ACS/WFC HST field observed under the GO-10424 and GO-11633 programmes (in red) and the NIRCam JWST field observed under the GO-1979 programme (in green) superimposed on a DSS image of NGC 6397. The region where the two datasets overlap is highlighted in yellow. We also show (in magenta) the field analysed in Milone et al. (2012a). The units are in arcminutes measured from the centre of the cluster. The blue dashed circles mark the half-light radius ($r_{\mathrm{h}}=2\stackrel{\prime }{.}90$; Harris 1996, 2010), 2 r_h and 3 r_h.