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Fig. 4.
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Residual investigation for identifying the sources of F1 and F2. All the other frequencies were subtracted as unperturbed sinusoidals. From top to bottom: (a) – both F1 and F2 are also sinusoidals; (b) – both are on the primary; (c) – F1 on primary, F2 on secondary; (d) – reverse of (c); (e) – both are on the secondary.
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