Diagrams in a picture: from 0°to 45° at interval of 2.5°:
Folded diagrams in a picture: from 0°to 45° at interval of 5°:
[On the modified bird base diagram given by Mr. J. Maekawa in the book:
"Origami no kikagaku [Geometry in Origami]" (in Japanese), Nippon-Hyoron-Sha, Tokyo (1979).]
References:

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