Dear Munsell Randall,
In WL it is extremely easy to import data from Excel files. The following code simply gets the data from your file, and then uses ListControurPlot[] function to draw the data. Just put the notebook and the plane.xlsx files in the same folder.
data = Import[NotebookDirectory[] <> "plane.xlsx"];
ListContourPlot[data]
Regards
Wojciech Artichowicz
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