I am very rusty at using Surfer13 to create isoline maps for some weather data. I have a dataset for approximately 1800 locations. I'd like to ensure I'm using the correct variogram model, but when I attempt to create a variogram, the option isn't available. I'm sure I'm missing a simple step to create the variogram but I don't recall having this problem before. Any help on how to proceed would be much appreciated.
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