Hello everbody!
I would like to instance of the gas mixture definition.
For example this is definition Argon-CO2 gas mixture by number of atoms in stoichiometry 9/1:
// Argon CO2 (90/10) 2atm
arco2_91_2atm	   -3  39.948 12.01 15.9994 18. 6. 8. 0.00346 0.9 0.1 0.2 
		    1 1   20. 0.001 
		    0
The same composition by component's weights:
// Argon CO2 (90/10) 2atm
arco2_91_2atm	   3  39.948 12.01 15.9994 18. 6. 8. 0.00346 0.8909 0.0298 0.0793 
		   1 1   20. 0.001 
		   0
In the both examples the gas medium is active. To deactivate it, one should change the first parameter in the second line (sensflag) to 0.
Best regards,
            Andrey