Errata: In description of Bode plot for second order transfer function, 'a' should be omega 0
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Location: page 253, line -1 and page 245, line 12
In two spots, the symbol is used where it should be . The first is the displayed equation for , which should read
The second is after the expressions for the gain and phase approximations, where should be replaced by .
(Contributed by L. Xiong, 29 Dec 08)