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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>As you can see from this graph, there are grey and blackish
areas in the graph but not mentioned on the legend. Any ideas why there are
black/grey areas and what do they mean?</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a
href="http://oss.oetiker.ch/smokeping-demo/?target=World.Europe.Switzerland.SWITCH">http://oss.oetiker.ch/smokeping-demo/?target=World.Europe.Switzerland.SWITCH</a></span></font></p>
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