The following table shows the averages 
(referred to 
and which, as mentioned above, are only
approximately accurate) and the averages 
of the rms
pressure coefficients
in the NTT for 
and various
zenith angles 
.
Whereas the average pressure 
depends
strongly on the inclination 
of the dummy, the
pressure variations 
are virtually
independent of 
.
The following table shows as an example the rms
values
of the
temporal variations of the normalized modal coefficients and of
the residual rms
for the measurements in which 
is
with various zenith angles 
.
They are for all 
of the same order of magnitude.
The data for defocus and astigmatism can be compared with the
corresponding data from the LASEN wind tunnel experiments
(fig. 
).
A comparison with figure , where the data have to
multiplied by two for defocus and about 
for astigmatism,
shows indeed the good agreement between the two experiments.
The power spectra of the pressure at the locations of the 13 sensors
and those computed for the various modes depend strongly on 
.
For 
the highest energy density is at about 0.2
Hz. For smaller zenith angles the turbulence is shifted to much higher
frequencies up to about 2 Hz.