freqz plot question

[Scott Raevsky]

Hello,

It's been years since I used Matlab, but one thing I remember is freqz
plotting the mag and phase response.  In octave, freqz plots a pass
band, a stop band, and phase.  What is the stop band for, and why is
it seperate from the pass band?  Seems like it should be just mag and
phase, where the pass and stop bands are part of the mag plot.

Thanks

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