Large q: *K*q(w/r) very large near w*=r* and small otherwise. Hence *|N**0*(*re*jq)| and *|M**0*(*re*jq)| will essentially be
determined by |*P*(*j**w*)| in a very narrow frequency range near w*=r* when q is large.

On the other hand, when q is small, a larger range
of frequency response |*P*(*j**w*)| around w*=r* will have affect on the
value *|N**0*(*re*jq)| and *|M**0*(*re*jq)|(This, in fact, will
imply that a right-plane zero (pole) with a much larger real part than
the imaginary part will have much worse effect on the performance
than a right-plane zero (pole) with a much larger imaginary part than
the real part).

Figure 16.6: *K*q(w/r) vs. normalized
frequency w/r