“…The spectral analyzer was constructed to operate at certain fixed frequencies; for this study, 20 frequency settings between 0.14 and 30 cycles per second were used. The device has been described in detail in earlier publications (30).…”
“…The spectral analyzer was constructed to operate at certain fixed frequencies; for this study, 20 frequency settings between 0.14 and 30 cycles per second were used. The device has been described in detail in earlier publications (30).…”
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