I want to know which software was used to create vector calculus graph

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Alexanddros81
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I want to know which software was used to create vector calculus graphs. The book is "Vector Calculus" by Marsden and Tromba 6th edition.
Hi.
I have the Marsden an Tromba vector calculus book 6th edition.
I was wondering which software was used to create the books graphs.
I attach two graphs as an example.
Thanks
 

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