MATLAB: I have to get the x values for peaks occuring in the plot? What will be the code for that

x value

The following is my code:
a = load('ra1.dat');
x = a(:,1);
y = a(:,2);
y_mov_average = filter(ones(1,10)/10,1,y);
plot(x,y);
dy = diff(y)./diff(x);

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