Table 7: ratio results.

FactorsLevelsTrial number / ratio
( )( )( ) SootISFC SootISFC

7%1
2
3
17%4
5
6
27%7
8
9

7.20%1
4
7
17.20%2
5
8
27.20%3
6
9

4°CA BTDC1
6
8
1°CA ATDC2
4
9
4°CA ATDC3
5
7