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Ratio of Distances    1/1, 1/3

Strutt|Propagation|Ratio of Distances, inserts the ratio of distances correction into the current row of the worksheet, to convert a measured sound level at a known distance (`d_1` to a sound level at a given distance `d_2`)

Strutt implements the formula as:

`Delta L = Clog_10(d_2/d_1)`, where

`C` is a constant and has the value 10 for line source (3 dB per doubling of distance), and has the value 20 for point source (6 dB for doubling of distance).

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