[Archive] draw isopotential line in SPIS

SPIS
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Message by Jiayi Bi:
Hello.
How to draw isopontential line in SPIS 5.1.8 using Cassandra?
isopontential lines like Figure.4 in \http://onlinelibrary.wiley.com/doi/10.1029/2007JA012269/full
Thank you very much!

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