Demerol	exp-drug
2.000000000e+000	0.000000000e+000
6.000000000e+000	8.000000000e+000
4.000000000e+000	1.000000000e+000
1.300000000e+001	4.000000000e+000
5.000000000e+000	2.000000000e+000
8.000000000e+000	2.000000000e+000
4.000000000e+000	1.000000000e+000
	3.000000000e+000