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saturation mixing ratio lines on a skew-T diagram

Saturation mixing ratio lines represent constant values of water vapor capacity. On the skew-T diagram, the saturation mixing-ratio (ws) lines are the slightly-curved, dashed lines sloping from the lower left to upper right. They are labeled at the bottom of the diagram for a range of 0.1 to 40.0 grams per kilogram; i.e., in parts of water vapor per 1000 parts of dry air. Note that since the vapor capacity of air varies non-linearly with temperature, the labeling interval for ws lines is not uniform.