% v1107Plot(fn, offset, Nfft)
%
% Read and plot a real-valued auto-correlation spectrum
% produced by swspectrometer
%
% fn     : file name and path
% offset : the number of the spectrum to read when the
%          file contains several
% Nfft   : number of FFT points used earlier to generate
%          the file
%
function v1107Plot(fn, offset, Nfft)

    if(offset<1), offset = 1, end

    Nssb=floor(Nfft/2) + 1;
    fs=16e6;

    fd=fopen(fn, 'rb', 'l');
    for jj=(1:offset),
        ydata=fread(fd, [Nssb 1], 'float32');
        fprintf(1, 'Read from offset %d\n', jj);
    end

    xdata=fs * (1:Nssb)/Nfft;
    semilogy(xdata, ydata);
    fclose(fd);

end