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I try to understand the following graphics with x-axis being the radius of a typical star :

I would like to knwo if ##\delta c/c## (y-axis) represents the relative error between theoretical and experimental values or if it represents the fluctuations of speed of sound inside. If these are fluctuations, one could get the mean speed all over radii or standard deviation.

I am not sure what it is exactly.

Any help is welcome

I would like to knwo if ##\delta c/c## (y-axis) represents the relative error between theoretical and experimental values or if it represents the fluctuations of speed of sound inside. If these are fluctuations, one could get the mean speed all over radii or standard deviation.

I am not sure what it is exactly.

Any help is welcome

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