You must have at more than 1 and less than 33 contour levels
You had a contour interval of .5 and a range of -10 to 10
Giving 40 contour levels
This plot is not dissimilar to the PNA

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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

Years:
1961
1962
1963
1964
1965

Dataset time range: 1948 to 2019

Dataset Information: NCEP/NCAR Reanalysis

Date submitted: 8/22/2019 at 10:05