Abstract
For 0.2% of the observing time during May-August 1970, the attenuations at 19 and 37 GHz were about 3.8 and 10.2 dB, respectively, the larger value being the maximum measurable with the technique used in the investigation. Previous attenuation statistics published for 19 GHz are updated to cover the period June 1968-August 1970.

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