That means that you have specified the "Internal Standard Concentration" for that particular peptide. If you blank out that value, the X-axis will go back to normal.
If you have specified the Internal Standard Concentration for a peptide, Skyline divides the X values by that number. In this way, if the Internal Standard Concentration that you have specified is close to what the actual concentration of the heavy peptide, then the slope of the calibration curve will be close to 1.
-- Nick |