diagram type

[dylanmikesell]

I am creating an issue for the diagram type plotting in both the iftan.py and ftan.py call. I will submit a commit to fix this issue, but wanted an issue to reference in the commit.

[dylanmikesell]

Should be fixed with 67db012 and 2dcc710. Needed a second commit because I forgot the ftan_call.py function.