Air: 26
Con: 50-4000

For New Curve (R² >= 0.9995):

for ppm = a*ratio^b:

Gas    | a       | b
H2     | 21.1794 | -0.7174
CO     | 20.89   | -0.6568
LPG    | 14.9745 | -0.1329
CH4    | 19.8094 | -0.09  
Alcohol| 20.2524 | -0.0655

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

Gas    | m       | b
H2     | -0.7174 | 1.3259 
CO     | -0.6568 | 1.3199 
LPG    | -0.1329 | 1.1754 
CH4    | -0.09   | 1.2969 
Alcohol| -0.0655 | 1.3065 


For Old Curve:

for ppm = a*ratio^b:

Gas    | a       | b
H2     | 21.1794 | -0.7174
CO     | 22.7441 | -0.6786
LPG    | 14.9745 | -0.1329
CH4    | 19.8094 | -0.09  
Alcohol| 20.2524 | -0.0655

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

Gas    | m       | b
H2     | -0.7174 | 1.3259 
CO     | -0.6786 | 1.3569 
LPG    | -0.1329 | 1.1754 
CH4    | -0.09   | 1.2969 
Alcohol| -0.0655 | 1.3065 

H2
50,1.27
100,0.8
400,0.275
1000,0.1417
4000,0.0518

%3.08
[(50,1.27), (100,0.8), (400,0.275), (1000,0.1417), (4000,0.0518)]

CO
50,1.6
100,1
400,0.3785
1000,0.21875
4000,0.09

%3.85
[(50,1.6), (100,1), (400,0.3785), (1000,0.21875), (4000,0.09)]

LPG
50,9
100,8
400,6.742
1000,6
4000,5

%30.77
[(50,9), (100,8), (400,6.742), (1000,6), (4000,5)]

CH4
50,14
100,12.785
400,11.668
1000,11.1467
4000,9

%49.18
[(50,14), (100,12.785), (400,11.668), (1000,11.1467), (4000,9)]

Alcohol
50,16
100,15
400,13
1000,12.785
4000,12.214

%57.69
[(50,16), (100,15), (400,13), (1000,12.785), (4000,12.214)]
