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Relationship between the z coordinates of chords passing through z axis for a two-turn reverse helical trajectory.
| λ1 | −2π≤λ1≤−π | −π<λ1<0 | 0≤λ1≤π | π<λ1≤2π | |
|---|---|---|---|---|---|
| z(λ1) | h∕2π(λ1) | h∕2π(λ1) | h∕2π(λ1) | h∕2π(λ1) | |
| One-turn chords | z(λ1) | h∕2π(λ1+π) | None | h∕2π(λ1+π) | None |
| Multiple-turn chords | z(λ2) | h∕2π(−λ1−π) | h∕2π(−λ1+π) | None | None |
