Plotting a 3-D surface plot in Matlab

Hi,

I have a spreadsheet file. The value in each cell represents the 'z' or height of the surface plot. And naturally, the x,y position of the value in the array forms the base.

The Matlab examples I'm finding online all use z = 'an equation' to plot the graphs. In my case, I already know my z values. Can someone help me with plotting this?

Thanks.
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