This applet is part of the online, interactive book [url=https://vector-calculus.github.io/]Vector Calculus[/url].[br][br]If you found this useful, you can support my work in Patreon:[br][br][url=https://www.patreon.com/jcponce]https://www.patreon.com/jcponce[/url][br][br]Thanks!