Figure 5: Echo power is plotted on a linear scale
versus Doppler frequency from +450 Hz (approaching) to -450 Hz
(receding). The central bar at the origin of each spectrum shows
+/- 1 standard deviation of the receiver noise. The spectra shown
were first averaged in 20-degree phase bins and then smoothed to a
frequency resolution of 30 Hz. The weighted-average phase is
given at the upper left of each spectrum. End-on views are at 0
and 180 degrees. The Doppler spectrum of Model 2 at each of these
weighted-average phases is shown in red for comparison with the
data. The greatest improvement in the spectral fit occurs at
rotation phases from 210 to 310 degrees, corresponding to views of
the M1 side.
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