Air: 70
Con: 200-10000

For New Curve (R² >= 0.9995):

for ppm = a*ratio^b:

Gas    | a       | b
H2     | 18391.5667| -1.4494
alcohol| 468.8045| -0.5574
LPG    | 152.1255| -0.2922
CH4    | 117.9639| -0.1448
CO     | 126.605 | -0.1173

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

Gas    | m       | b
H2     | -1.4494 | 4.2646 
alcohol| -0.5574 | 2.671  
LPG    | -0.2922 | 2.1822 
CH4    | -0.1448 | 2.0717 
CO     | -0.1173 | 2.1025 


For Old Curve:

for ppm = a*ratio^b:

Gas    | a       | b
H2     | 8344.9307| -1.2999
alcohol| 468.8045| -0.5574
LPG    | 152.1255| -0.2922
CH4    | 117.9639| -0.1448
CO     | 126.605 | -0.1173

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

Gas    | m       | b
H2     | -1.2999 | 3.9214 
alcohol| -0.5574 | 2.671  
LPG    | -0.2922 | 2.1822 
CH4    | -0.1448 | 2.0717 
CO     | -0.1173 | 2.1025 

H2
200,8.5
500,2.7
800,1.4
1000,1
1500,0.564
2000,0.376
3000,0.212
5000,0.0965
10000,0.0293

%1.43
[(200,8.5), (500,2.7), (800,1.4), (1000,1), (1500,0.564), (2000,0.376), (3000,0.212), (5000,0.0965), (10000,0.0293)]

alcohol
200,24.47
500,14.475
800,11.13
1000,10.364
1500,8
2000,7.1
3000,5.3
5000,4
10000,2.36

%14.81
[(200,24.47), (500,14.475), (800,11.13), (1000,10.364), (1500,8), (2000,7.1), (3000,5.3), (5000,4), (10000,2.36)]

LPG
200,34.17
500,23.328
800,20.7
1000,19.274
1500,17.1
2000,15.9
3000,14.825
5000,13.8
10000,12.54

%27.53
[(200,34.17), (500,23.328), (800,20.7), (1000,19.274), (1500,17.1), (2000,15.9), (3000,14.825), (5000,13.8), (10000,12.54)]

CH4
200,55
500,45.5
800,45.5
1000,44.43
1500, 41.36
2000, 40.385
3000, 37.6
5000, 34.17
10000, 29.6

%63.47
[(200,55), (500,45.5), (800,45.5), (1000,44.43), (1500, 41.36), (2000, 40.385), (3000, 37.6), (5000, 34.17), (10000, 29.6)]

CO
200,65
500,62
800,60.6
1000,56.4
1500,55.1
2000,52.5
3000,50.1
5000,45.5
10000,40.385

%80.57
[(200,65), (500,62), (800,60.6), (1000,56.4), (1500,55.1), (2000,52.5), (3000,50.1), (5000,45.5), (10000,40.385)]
