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Based on the recently developed  \"dendrogram-technique\", this characterizes dense cores as well as the enveloping clouds. \"Larson's 3rd Law\" of constant column density, m(r) = C*r^2, is not well suited to describe the derived mass-size data. Solar neighborhood clouds not forming massive stars (< 10 M_sun; Pipe Nebula, Taurus, Perseus, and Ophiuchus) obey m(r) < 870 M_sun (r / pc)^1.33  . 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