deletions | additions       diff --git a/Payam.tex b/Payam.tex  index 576a06c..bffe437 100644  --- a/Payam.tex  +++ b/Payam.tex 
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\citet{Espanol_Rubio_Zuniga_1995} for discussion of how HD disturbances propagate, and evidence for faster-than-vorticity interaction. One considers incompressible and the other considers compressible; the vorticity time-scale is not the only important time-scale.\\  \citet{Clercx_1997};\\  \citet{Kao_Yodh_Pine_1993} for high-speed experiment;\\  \citet{nderson_Mitchell_Bartlett_2002} describe an experiment where sonic communication is observed. observed.\\   \citet{10.1103/PhysRevE.74.031402} coarse-graining. dsa  \item Does Payam assume incompressible flow somewhere -- e.g. when setting up the thin jet equations?