Air: 10
Con: 200-10000

For New Curve (R² >= 0.9995):

for ppm = a*ratio^b:

Gas    | a       | b
LPG    | 20.3079 | -0.4349
CH4    | 22.011  | -0.4029
H2     | 26.9497 | -0.2956
Alcohol| 19.3261 | -0.1655
CO     | 13.4917 | -0.0777

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

Gas    | m       | b
LPG    | -0.4349 | 1.3077 
CH4    | -0.4029 | 1.3426 
H2     | -0.2956 | 1.4306 
Alcohol| -0.1655 | 1.2861 
CO     | -0.0777 | 1.1301 


For Old Curve:

for ppm = a*ratio^b:

Gas    | a       | b
LPG    | 20.3079 | -0.4349
CH4    | 22.011  | -0.4029
H2     | 26.9497 | -0.2956
Alcohol| 19.3261 | -0.1655
CO     | 13.4917 | -0.0777

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

Gas    | m       | b
LPG    | -0.4349 | 1.3077 
CH4    | -0.4029 | 1.3426 
H2     | -0.2956 | 1.4306 
Alcohol| -0.1655 | 1.2861 
CO     | -0.0777 | 1.1301 

LPG
200,2.04
500,1.35
800,1.1
1000,1
1500,0.84
2000,0.738
3000,0.634
5000,0.51
10000,0.39

%10
[(200,2.04), (500,1.35), (800,1.1), (1000,1), (1500,0.84), (2000,0.738), (3000,0.634), (5000,0.51), (10000,0.39)]

CH4
200,2.6
500,1.815
800,1.5
1000,1.35
1500,1.15
2000,1
3000,0.9
5000,0.71
10000,0.544

%13.5
[(200,2.6), (500,1.815), (800,1.5), (1000,1.35), (1500,1.15), (2000,1), (3000,0.9), (5000,0.71), (10000,0.544)]

H2
200,5.77
500,4.26
800,3.66
1000,3.37
1500,3
2000,2.8
3000,2.46
5000,2.27
10000,2.064

%33.7
[(200,5.77), (500,4.26), (800,3.66), (1000,3.37), (1500,3), (2000,2.8), (3000,2.46), (5000,2.27), (10000,2.064)]

Alcohol
200,8
500,7
800,6.41
1000,6.12
1500,5.77
2000,5.5
3000,5.08
5000,4.68
10000,4.26

%61.2
[(200,8), (500,7), (800,6.41), (1000,6.12), (1500,5.77), (2000,5.5), (3000,5.08), (5000,4.68), (10000,4.26)]

CO
200,8.9
500,8.4
800,8
1000,7.8
1500,7.64
2000,7.55
3000,7.3
5000,7
10000,6.5

%78
[(200,8.9), (500,8.4), (800,8), (1000,7.8), (1500,7.64), (2000,7.55), (3000,7.3), (5000,7), (10000,6.5)]
