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�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