Draw the half-line from $x$ at angle $\phi$ to $\theta$.
The line $T$ makes a right angle with the chosen direction.
Then $F$ and $G$ make angle $\alpha$.
Let $ABC$ be an angle of sixty degrees.
The two lines intersect at an angle of ninety degrees.
As the point $z$ moves around the unit circle, the corresponding $J_z$'s are rotations of angle $t(z)$.
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