At line 177 and 210 of mean_access_time.pl the variable start_avg is set to 0
$info{$j}{$i}{start_avg} = 0;
However the variable employed for the computation of the MAT and MCT is called mean_start (e.g. line 171 and 185). Is that the remnant of an old variable or should the variable mean_start be set to 0 instead of start_avg ?
It doesn't seem to affect the results therefore I guess it's an old variable.