= Neutral buoyancy-flux mode of a pure plume
{title2=$(\delta Q/Q,\delta M/M,\delta F/F)\propto(1,2,3)$}
A constant surviving <buoyancy flux> sets the amplitudes of a <pure plume>: $Q\propto F^{1/3}$ and $M\propto F^{2/3}$. Relative-flux perturbations have the neutral ratio $(\delta Q/Q,\delta M/M,\delta F/F)\propto(1,2,3)$. This is the zero-eigenvalue limit of <growing mode of power-law plume similarity>; nonzero endpoint stratification can still create cumulative logarithmic flux loss.
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