+proj=tmerc +lat_0=0 +lon_0=15 +k=0.9996 +x_0=2520000 +y_0=0 +ellps=intl +units=m +nadgrids=C:\SITDWH\CARTO\grigliati\ItalyRome40ToWGS84_NTV2_GN.gsb +no_defs


oppure:
+proj=tmerc +lat_0=0 +lon_0=15 +k=0.9996 +x_0=2520000 +y_0=0 +ellps=intl +units=m +nadgrids=C:\Programmi\FWTools2.4.7\proj_lib\ItalyRome40ToWGS84_NTV2_GN.gsb +no_defs