Using analysis tools

VisIt has a large number of quantitative analysis tools.
Bring up a pseudocolor plot.
Overlay the mesh for reference.
Choose the "Node Pick" tool next to the compass tool. Now you can click on any place on the mesh and bring up quantitative information corresponding to that node/zone.
Try clicking a few points. This will bring up a sub-menu with information for each point. You can add Variables to be displayed for each clicked point. Add "tas" to that list.