subject druga drugb
1         2.0   3.5
2         3.6   5.7
3         2.6   2.9
4         2.6   2.4
5         7.3   9.9
6         3.4   3.3
7        14.9  16.7
8         6.6   6.0
9         2.3   3.8
10        2.0   4.0
11        6.8   9.1
12        8.5  20.9