The distribution of 67.7 MeV proton release time differences as obtained from TSA (using the VDA path length) and VDA, respectively. The value of the difference equals the difference between the actual 67.7 MeV onset time and the value obtained from the VDA fit at 67.7 MeV. Events with differences more than an hour have been dropped. The mean value and the standard deviation of the difference are 10 min and 17 min, respectively. The error bars denote the statistical error, only. The numbers on the abscissa denote the lower limit of the time difference bin.