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Fig. 10. The four general types of solution to the longitudinal equations of motion.
(A) Monotonic subsidence (stable), corresponding to a negative real root. (B)
Monotonic divergence (unstable), corresponding to a positive real root. (C)
Damped oscillation (stable), corresponding to a complex conjugate pair of
roots with negative real parts. (D) Divergent oscillation (unstable),
corresponding to a complex conjugate pair of roots with positive real
parts.
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