Don't take that to serious :D I wasn't able find curve or any parabolic shape so i took fib circles...maybe i have right or that just big coincidence.
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Or... i.imgur.com/RiTPiWX.png
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Even better. Sorry never used that fib circles
i.imgur.com/89YCOWX.png
i.imgur.com/89YCOWX.png
