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diff --git a/257/CH11/EX11.13/example_11_13.sce b/257/CH11/EX11.13/example_11_13.sce
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+s=poly(0,'s'); 
+F=syslin('c',[(1+0.2*s)*(1+0.025*s)/((1+0.001*s)*s^(3)*(0.005*s+1))]) 
+
+fmin=0.1; //Min freq in Hz
+fmax=20; //Max freq in Hz
+
+scf(1);clf;
+bode(F,fmin,fmax); //Plots frequency response of open-loop system in Bode diagram
+
+[GainMargin,freqGM]=g_margin(F) //Calculates gain margin [dB] and corresponding frequency [Hz]
+disp(freqGM*2*3.14,"omegaPC=")
+show_margins(F) //display gain and phase margin and associated crossover frequencies
+
+//for omegaPC=16.54 ; the plot needs to be shifted by 64dB
+k1=10^(64/20)    
+
+//for omegaPC =400 ; the plot needs to be shifted by 100dB
+k2=10^(100/20)
+
+disp(k1,k2,"the 2 values k lies between are")