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Table A.1: Values of the outgoing wave amplitude (km s^-1) imposed at the top of the atmosphere which, once integrated backward, give rms velocity field fluctuations values at the base between $20{\rm ~km~s^{-1}}$ and $30{\rm ~km~s^{-1}}$ . L(r) signifies that an expanding turbulent lengthscale has been used. Except where indicated a flat spectrum is imposed at the top boundary.