P. 138, line 6 (large boxed equation)

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The equation should be:

x(t)=x˙0+x0ωn(ζ+ζ21)2ωnζ21e(ζωn+ωnζ21)tx˙0x0ωn(ζ+ζ21)2ωnζ21e(ζωnωnζ21)t.

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