How to plot fft for following code?

2019 3 3
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hello experts can any one tell me how to plot fft / frequency response for following code / wav file ??
[y,fs]= audioread ('filename');
t0= 0.5;
n=round(t0*fs);
t=linspace (0,t0,n);
data=y(1:n,1);
plot (t,data)

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