conc	signal
1.2474	0.82146
1.2474	0.81281
0.567	0.8212
0.567	0.82604
0.3335	0.86347
0.3335	0.86439
0.29	0.87502
0.29	0.89357
0.2522	0.88826
0.2522	0.89738
0.194	0.8739
0.194	0.89789
9.7e-2	0.96767
9.7e-2	0.96447