Air: 595.18
Con: 1000-20000

For New Curve (R² >= 0.9995):

for ppm = a*ratio^b:

Gas    | a       | b
CH4    | 2669.39 | -0.3784

for ppm = 10^[(log10(ratio)-b)/m]:

Gas    | m       | b
CH4    | -0.3784 | 3.4264 


For Old Curve:

for ppm = a*ratio^b:

Gas    | a       | b
CH4    | 2669.39 | -0.3784

for ppm = 10^[(log10(ratio)-b)/m]:

Gas    | m       | b
CH4    | -0.3784 | 3.4264 

CH4
3000, 131
5000, 105.554
8000, 84.117
12000, 77.148
15000, 70
20000, 66.313

%17.73
[(3000, 131), (5000, 105.554), (8000, 84.117), (12000, 77.148), (15000, 70), (20000, 66.313)]
