e = max-min / max+min

reference run-  max = 10.4mW, min=3.7uW, e = 0.99929 data taken 2017-06-15

run 1: max=10.4mW, min=7.3uW, e = 0.99860
run 2: max=10.4mW, min=13.6uW, e = 0.99739
run 3: max=10.4mW, min=22.7uW, e = 0.99564
run 4: max=10.4mW, min=51.5uW, e = 0.99001
run 5: max=10.2mW, min=107.6uW, e = 0.97912
run 6: max=10.2mW, min=205.7uW, e = 0.96046