CONTENTS

Policy on Intellectual Property Right (IPR)
Annex 1
�1���� The formula for the radio refractive index
�2���� Surface refractivity and height dependence
������� 2.1���� Refractivity as a function of height
������� 2.2���� Wet term of the surface refractivity
�3���� Vertical refractivity gradients
������� 3.1���� In the first kilometre of the atmosphere
������� 3.2���� In the lowest atmospheric layer
�4���� Statistical distribution of refractivity gradients
�5���� Surface and elevated ducts