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  • $\begingroup$ Why do you have such dream? If you know for sure that there should be only one peak, then you only need to fid its frequency. In this case @JasonB's solution is the perfect way of doing it. $\endgroup$ Commented Apr 4, 2016 at 16:46
  • $\begingroup$ @BlacKow. According to my theoretical expectations, there should be only one peak. But I need to prove this using the experimental raw data, not only by theoretical assumption. However, there are too many noise in the data. $\endgroup$ Commented Apr 5, 2016 at 4:17