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.TH zgrid 1 "April 1993" "Scilab Group" "Scilab Function"
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plots z-plane grid lines: lines of constant
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damping factor (zeta) and natural frequency (Wn) are
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drawn in within the unit Z-plane circle.
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Iso-frequency curves are shown in frequency*step on the
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interval [0,0.5]. Upper limit corresponds to Shannon
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frequency \fV( 1/dt > 2*f )\fR.