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@@ -245,7 +245,8 @@ signal_time_domain= ifos[k].time_domain_strain
 signal_freq_domain = np.fft.rfft(signal_time_domain)
 ```   
 If both of 2 methods above are correct, 2 frequency domain signals we get should be the same, at least very similar.
-Actually, They are similar in shape but the order of magnitude are very different. I don't know why.       
+Actually, They are similar in shape but the order of magnitude are very different.    
+This is due to different normalization items.     
 ![signal_freq_Weichangfeng_method](uploads/8e27887501d8aba9a1631c05342d6a3f/signal_freq_Weichangfeng_method.png)    
 ![signal_freq_Hunter_method](uploads/c5b668283727bdc9f544f81ea23465ee/signal_freq_Hunter_method.png)