countour plot of three variable ?

Hi I have thistext file ( please see attached )with 3 columns ( lat, lon and depth ) I want to plot a contour map of the water depth as a function of lat and lon. I used the following code contour (lat,lon,depth) where I extracted lat, lon, and depth separately but I get this error "Z must be at least a 2x2 matrix."
any help ? thanks

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