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diff --git a/257/CH7/EX7.8/example_7_8.sce b/257/CH7/EX7.8/example_7_8.sce
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+q=poly([1 1.105 0.1055 0.0005],'s','coeff');
+G=20000/q //gain FACTOR=20000
+H=1
+y=G*H
+p=poly([0 1],'s','coeff');
+R=1000/p
+
+Kp=limit(s*y/s,s,0)
+Ess=1000/(1+Kp)
+
+Css=1000-Ess
+disp(Css," Css = ")