Triple differential cross section (TDCS) for electron impact ionization of magnesium at incident energies of (a) 13.65 eV, (b) 17.65 eV, (c) 22.65 eV, (d) 27.65 eV, (e) 37.65 eV, (f) 47.65 eV, (g) 57.65 eV, and (h) 67.65 eV in the doubly symmetric geometries. The solid curve represents our DS3C calculations, the dashed curve corresponds to 3C results, and the dotted curve corresponds to DWBA results of Hitawalaet al.,^[10]whereas the solid circles are the experimental data from Murray.^[7]Kinematics is displayed in each frame and the theoretical results and experimental data have been normalized to unity at the symmetric scattering angleθ= 50° for all the incident electron energies.