Errata: Caption for Figure 12.4 doesn't quite match figure

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Location: page 351, line 2,3

In the caption for Figure 12.4, there are a couple of small errors:

  • Nyquist curves for is solid and is dashed
  • The point that is projected is .

The correct caption reads

Geometric interpretation of . At each frequency, the points on the Nyquist curve for (solid) and (dashed) are projected onto a sphere of radius sitting at the origin of the complex plane. The projection of the point is shown.

(Contributed by R. M. Murray, 30 Nov 08)