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Cross section grib file



I would need to display a cross-section of the equivalent potential temperature. I'm working with a GRIB file and I've obtained an error related to missing values when using the wrf_user_ll_to_ij function. I have installed NCL version 6.4.0. I don't understand why there is missing data if it is a direct output of the model. I enclose the model output and script I'm using. Could you please help me?

Thanks in advance.