I don't understand how contour plots work !!!

Hi guys,

So I have this data and I am trying to plot a contour graph with : depth as Y, the hours as X, and the temperature as the data assigned to each depth and hour. But whatever I try, I have something that does not work, be it matrix dimension or something else. I do not understand how I should define each variable, X Y Z, when it shouldn't be too complicated ! does anyone have any kind of hints or help ? The blanks are simply times when the temperature could not be recorded, but that shouldn't be a problem in a contour plot should it ?? I am getting really desperate

[Walter Roberson]

Duplicate question merged into original https://www.mathworks.com/matlabcentral/answers/367824-plot-a-time-depth-temperature-contour-graph