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Published online by Cambridge University Press: 14 August 2015
The formaldehyde molecule is an excellent probe of physical conditions inside interstellar clouds. We illustrate this by presenting results of our recent series of observations using the MPIfR Effelsberg 100-m radio telescope for the 6-cm transition, the NRAO Green Bank 43-m radio telescope for the 2-cm transition and the NRAO Kitt Peak 11-m mm-wave telescope for the 2-mm transition.