A final overall
total comet score for all 100 cells was obtained by
summing up the number of cells in each class times
the class number, giving a rating between 0 (completely
undamaged) and 400 (maximum damaged) Collins20)
i.e. total comet score TCS=0(n) + 1(n) + 2(n) + 3(n) +
4(n), where (n) indicates the number of cells in each
class.