Level curves of the ratio between the frequencies: fo/fs (dashed black line), fn/fs (dotted blue line) and fo/fn (red line). For the comparison with the secular frequency we plot the ratio 1 and 10. For the comparison between the fast frequencies (fo/fn) we plot the levels 1, 2, 5 and 10. The red symbols (cross, triangle and circle) represent the position of three binary systems (see Sect. 2.5).
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