You must have more than 1 and less than 33 contour levels.
You had a contour interval of 0.5 and a range of -10 to 10
yielding 40 contour levels

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2011
Dataset time range: 1948 to 2023

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- Get a copy of the netcdf data file used for the plot: how to read netcdf
- Get a copy of the text data file used for the plot
- Get postscript file
2011
Dataset time range: 1948 to 2023
Dataset Information: NCEP/NCAR Reanalysis
Date submitted: 12/9/2023 at 11:00