Hi, I have a question about the different results of calibration of the GC for DME/CO and DME/CO2. The calibration of mass flow controller of DME, CO and CO2 was done at first, then I set three or four different flow rate of DME, fix the flow rate of CO or CO2. Finally, get the equation for the calibration results of GC. The DME/CO is y=0.4904x, the DME/CO2 is y=0.8204x. Why they have big difference? The equations should be close, I mean the coefficient. Thanks.