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== Beschreibung ==
Nighttime total radiation at the Kepler observatory in Linz (Austria) measured under the exceptionally cloudy conditions from January to July 2013 - most overcast nights since the beginning of the records. Note that the median approaches one Milliwatt per square meter due to the dominating c,oud reflection. Graphcis G. Wuchterl 2013, data from the Linzer Astronomische Gemeinschaft.