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for (j=0;j<N;j++) data[j]=10.0*exp(-1.*SQR(j-M)/SQR(N/8))* (cos(2.0*pi*32*j/N)+cos(2.0*pi*64*j/N)); slep.adddataseg(data); // Note: text should clarify this usage } spec=slep.spectrum(); freq=slep.frequencies(); freq1=32.0/N; freq2=64.0/N;