The beginning of each cross section is indicated by the large dot, which is plotted on left edge of the cross-sections below. Red and blue indicate the Lagrangian deformation (strain). Potential temperature is plotted in black. Potential vorticity is plotted in purple. The PV = 2 and PV = 4 contours are heavy. The normal component of the wind is contoured in gray. Positive is out of the page. Ticks are plotted along the paths at 1000 km intervals.
