The phase starts out at minus 180 degrees and runs along that graph line to a frequency of 90 Hz. At that point it flips to plus 180 degrees and tracks along the plus 180 line to a frequency of 8 kHz. It falls to plus 135 degrees at 45 kHz. It crosses 90 degrees at 500 kHz and has fallen to 25 degrees at 1 MHz.
End of verbal description.
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