Click on the Contour Labels button to pop up a panel of controls which affect how contour labels are drawn.
Line Labels controls how label positions are chosen (what NCAR calls a penalty scheme). Select Off if no labels are desired. Select Quick & Dirty to employ a fast algorithm that may not produce the most readable plot. Choose Slow & Tidy if sparser, well-chosen labels are worth the extra time they take to generate.
Line Label Angle:
There are three options for the Line Label Angle at which contour line labels can be drawn:
To include labels for relative maxima and minima in a contour plot, turn this option On.
Contour line labels and High/Low labels can be drawn in their own boxes. These boxes may be: