Air: 9.7
Con: 200-10000

For New Curve (R² >= 0.9995):

for ppm = a*ratio^b:

Gas    | a       | b
CO     | 16.8797 | -0.4445
LPG    | 24.918  | -0.4695
CH4    | 21.8247 | -0.3663

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

Gas    | m       | b
CO     | -0.4445 | 1.2274 
LPG    | -0.4695 | 1.3965 
CH4    | -0.3663 | 1.3389 


For Old Curve:

for ppm = a*ratio^b:

Gas    | a       | b
CO     | 16.8797 | -0.4445
LPG    | 24.0955 | -0.4629
CH4    | 21.8247 | -0.3663

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

Gas    | m       | b
CO     | -0.4445 | 1.2274 
LPG    | -0.4629 | 1.3819 
CH4    | -0.3663 | 1.3389 

CO
200,1.6
500,1.07
800,0.87
1000,0.775

%8
[(200,1.6), (500,1.07), (800,0.87), (1000,0.775)]

LPG
200,2.071
500,1.35
800,1.1
1000,1
1500,0.82
2000,0.71
3000,0.59
5000,0.46
10000,0.33

%10.31
[(200,2.071), (500,1.35), (800,1.1), (1000,1), (1500,0.82), (2000,0.71), (3000,0.59), (5000,0.46), (10000,0.33)]

CH4
200,3.1
500,2.277
800,1.9
1000,1.75
1500,1.52
2000,1.35
3000,1.16
5000,0.94
10000,0.7

%18.04
[(200,3.1), (500,2.277), (800,1.9), (1000,1.75), (1500,1.52), (2000,1.35), (3000,1.16), (5000,0.94), (10000,0.7)]
