Method for a quantitative investigation of the frozen flow hypothesis

Details of the Data Used for Fig. 1 ^a

^a  $N_l:$  Number of layers identified in a data set. The fact that more layers can be identified in the 3.5-m data than in the 1.5-m data is due to the higher signal-to-noise ratio of the 3.5-m autocorrelation. The relative layer strengths, $C_i^2(0),$ of each identified layer are given below the wind velocity, $v_w,$ of the respective layer. $t_{50}$ and $t_{90}$ are the time during which the cumulative autocorrelation stays above 0.5 and 0.9, respectively.
^b  There is evidence that this very strong layer consists of two or three individual layers moving with similar velocities.
^c  The very fast layers move across the telescope aperture too quickly to obtain reliable measurements of their relative strengths.