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Fic. 4—Cross sections of temperature and humidity; above: derived from 
aerological soundings; below: derived from snow-crystal analysis, Hohen- 
peissenberg, March 20, 1958 (Operation 26) 
concluded, that the analysis of snow crystals pre- 
sents more details of the synoptic development 
than the aerological soundings that, because of 
their 12-hour intervals, often do not show these 
details. 
Frequency analysis—The analyses of shape and 
size of snow crystals were also correlated with 
special studies on their frequency of occurrence. 
Frequency analyses have manifold significance 
in problems of cloud physics. They present infor- 
mation in connection with the intensity of pre- 
cipitation and its dependence upon certain quali- 
ties, for instance, as carrier of atmospheric 
electric charges, radioactive fission products, and 
so on. They give also information as to the quan- 
tity of freezing nuclei contained in an air layer 
