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2001 Flight altitudes of coastal birds 211<br />
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25 12 1,5 1,5 12 25<br />
25<br />
Flight altitudes, upper limits [m]<br />
12 1,5 1,5 12 25<br />
Flight altitudes, upper limits [m]<br />
Figure 4 . Common Eider flight altitudes on days with �W-SW winds off Wangerooge<br />
(upper) and Common Eider flight altitudes on days with �E-SE winds off<br />
Wangerooge (lower), autumn 1999. <strong>The</strong> bars show in each case the most<br />
frequent level; westerly migrants to the left, easterly to the right of the central<br />
axis.<br />
Figuur 4. Vlieghoogtes van Eiders op dagen met �W-ZW-winden langs Wangerooge<br />
(boven) en vlieghoogtes op dagen met �O-ZO-winden (onder), najaar 1999.<br />
De staven geven voor iedere dag de meest frequente vlieghoogte weer;<br />
westwaarts vliegende vogels links, oostwaarts vliegende vogels rechts van de<br />
y-as.