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Mac the Scope Screen Shot

Spectrum analyzer; imaginary vs. real (a.k.a. complex-plane, Nyquist, Cole-Cole or "polar" plot)
Near field complex plane transfer function of loudspeaker woofer. Imaginary part is inverted. Frequency range shown 20 Hz - 1000 Hz (is adjustable). The 1000 Hz data point lies near the origin (0,0).

Related screen shot:

Spectrum analyzer; transfer function display plus real and imaginary parts of complex transfer function.