In continuation of measurements at very low energies1,2 the correlation in angle and energy of two of the emitted α-particles has been measured with standard coincidence technique at a proton energy of 675 keV (2-, level in12C at 16.57 MeV) by placing two surface-barrier-detectors in the plane perpendicular to the beam. The results are displayed in a Dalitz-diagramm, the pertinent formulae for conversion of laboratory system to c.m. system are given. The distribution of points in this plot shows that the decay from the reached level in12C proceeds only by sequential decay3. This confirms earlier results found at very low energies (130 keV and 250 keV) but differs from those found at a proton energy of 163 keV (2+, level in12C at 16.11 MeV).