data from serial dilution experiement:
first, for each of 10 unknowns, dilutions 1,1,1/3,1/3,1/9,1/9,1/27,1/27
then, standards at dilutions 1,1,1/2,1/2,1/4,1/4,1/8,1/8,1/16,1/16,1/32,1/32,1/64,1/64,0,0

43.573
38.135
19.6
19.371
15.811
15.23
13.08
14.602
43.838
40.788
23.239
20.382
16.391
15.693
13.976
15.305
93.558
84.346
48.565
42.74
26.947
27.146
18.02
18.186
53.164
48.379
21.747
19.997
16.144
15.865
14.728
15.383
30.102
29.38
18.256
17.176
15.218
14.015
15.137
15.546
37.471
38.611
19.991
20.22
15.573
15.534
14.665
16.397
73.832
73.206
37.795
36.812
21.489
22.153
16.385
18.692
19.164
19.522
16.09
15.789
14.86
14.755
14.274
16.063
49.591
43.75
23.97
24.087
17.314
17.573
15.609
17.122
25.955
26.611
18.144
18.565
15.88
16.752
14.95
17.032
101.835
121.417
105.167
114.084
92.698
93.287
72.406
61.068
57.546
46.923
38.544
35.05
26.608
24.974
14.7
14.2