Illustration of the importance of source position with respect to nodes and antinodes of the eigenfunction associated to a mode to explain its asymmetry. The blue and red lines show the radial profile of the oscillation for two angular frequencies very close to one another (ωred < ωblue). The bold vertical dashed lines show two source positions generating opposite mode asymmetries: positive for r1, negative for r2. The third vertical dashed line marks the edge of the acoustic cavity r = a.
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