Chemical	Brightness
1	77.199
1	74.466
1	92.746
1	76.208
1	82.876
2	80.522
2	79.306
2	81.914
2	80.346
2	73.385
3	79.417
3	78.017
3	91.596
3	80.802
3	80.626
4	78.001
4	78.358
4	77.544
4	77.364
4	77.386