Surfpatch command G1 & G2

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Hello everyone,
I am fairly new to AutoCAD, and have been experimenting with 3D modeling. When I create a open/hollow 3D object and put a cover or "patch" on whichever surface I desire, I noticed that there are three forms of continuity: G0, G1, & G2. I've noticed that G0 is a flat surface patch, which does not apply to the "bulge magnitude" property. I do not understand the difference between the G1 and G2 forms of continuity, they both look fairly similar. I watched a short video on surfpatch (https://knowledge.autodesk.com/support/autocad/learn-explore/caas/screencast/Main/Details/6f8f975f-5...), but it did not go in depth with the G#s continuity properties. Could someone please help explain the difference between G1 & G2 to me? Thank you in advance.