Air: 4.4
Con: 200-10000

For New Curve (R² >= 0.9995):

for ppm = a*ratio^b:

Gas    | a       | b
CH4    | 11.5517 | -0.3541
LPG    | 14.1866 | -0.3227
H2     | 9.6432  | -0.1765
smoke  | 7.05    | -0.1065
alcohol| 5.7994  | -0.0696
CO     | 5.49    | -0.0495

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

Gas    | m       | b
CH4    | -0.3541 | 1.0626 
LPG    | -0.3227 | 1.1519 
H2     | -0.1765 | 0.9842 
smoke  | -0.1065 | 0.8482 
alcohol| -0.0696 | 0.7634 
CO     | -0.0495 | 0.7396 


For Old Curve:

for ppm = a*ratio^b:

Gas    | a       | b
CH4    | 11.5517 | -0.3541
LPG    | 14.1866 | -0.3227
H2     | 9.6432  | -0.1765
smoke  | 7.05    | -0.1065
alcohol| 5.7994  | -0.0696
CO     | 5.49    | -0.0495

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

Gas    | m       | b
CH4    | -0.3541 | 1.0626 
LPG    | -0.3227 | 1.1519 
H2     | -0.1765 | 0.9842 
smoke  | -0.1065 | 0.8482 
alcohol| -0.0696 | 0.7634 
CO     | -0.0495 | 0.7396 


CH4
200,1.77
1000,1
5000,0.57
10000,0.44

%22.73
[(200,1.77), (1000,1), (5000,0.57), (10000,0.44)]

LPG
200,2.573
1000,1.51
5000,0.91
10000,0.74

%34.32
[(200,2.573), (1000,1.51), (5000,0.91), (10000,0.74)]

H2
200,3.79
1000,2.835
5000,2.15
10000,1.9

%64.43
[(200,3.79), (1000,2.835), (5000,2.15), (10000,1.9)]

smoke
200,3.93
1000,3.53
5000,2.87
10000,2.54

%80.23
[(200,3.93), (1000,3.53), (5000,2.87), (10000,2.54)]

alcohol
200,4
1000,3.61
5000,3.2
10000,3.05

%82.05
[(200,4), (1000,3.61), (5000,3.2), (10000,3.05)]

CO
200,4.28
1000,3.79
5000,3.61
10000,3.52

%86.14
[(200,4.28), (1000,3.79), (5000,3.61), (10000,3.52)]
