English: This is a Skew-T log-P diagram, one of the four Thermodynamic diagrams in use around the world to plot atmospheric data of Temperature versus Humidity with height. Red lines are isotherms, solid green lines are the potential temperature, and dashed green lines are the equivalent potential temperature; these three all use the temperature scale at the horizontal 1000 mb level near the bottom. The blue lines are the isobars (scale on the left side) and the dashed pink lines are the saturated humidity mixing ratio (scale inside the graph, near the right).