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== CCIR interpolation formula == It is possible to extrapolate the cumulative attenuation distribution at a given location by using the CCIR interpolation formula:<ref>CCIR [1990] Report 564-4 "Propagation data and prediction methods required for earth-space telecommunication systems"</ref> : ''A''<sub>''p''</sub> = ''A''<sub>001</sub> 0.12 ''p''<sup>−(0.546 − 0.0043 log<sub>10</sub> ''p'')</sup>. where ''A''<sub>''p''</sub> is the attenuation in dB exceeded for a ''p'' percentage of the time and ''A''<sub>001</sub> is the attenuation exceeded for 0.01% of the time.
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