The Rytov number is a fundamental scaling parameter for laser propagation through atmospheric turbulence. Rytov numbers greater than 0.2 are generally considered to be strong scintillation. A Rytov number of 0 would indicate no turbulence, thus no scintillation of the beam.
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“Can it be, that the Greek grammarians invented their dual number for the particular benefit of twins?”
—Herman Melville (1819–1891)