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subroutine nuttal_window(win,n)
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real win(n)
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pi=4.0*atan(1.0)
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a0=0.3635819
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a1=-0.4891775;
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a2=0.1365995;
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a3=-0.0106411;
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do i=1,n
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win(i)=a0+a1*cos(2*pi*(i-1)/(n))+ &
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a2*cos(4*pi*(i-1)/(n))+ &
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a3*cos(6*pi*(i-1)/(n))
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enddo
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return
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end subroutine nuttal_window
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