CONTENTS

Attenuation due to clouds and fog     1
Policy on Intellectual Property Right (IPR)     ii
RECOMMENDATION  ITU-R  P.840-4     1
Attenuation due to clouds and fog     1
Scope     1
Annex 1     1
1 Introduction  1
2 Specific attenuation coefficient 2
3 Cloud attenuation  3
4 Total columnar content of cloud liquid water 3
5     Statistical distribution of total columnar content of cloud liquid water 7