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@@ -227,7 +227,7 @@ However, SNR would be good if it is greater than 10. This can be fixed by adjust
 SNR_L1 = 21.86, SNR_H1 = 18.43, SNR_V1 = 10.87   
 Now they well meet the requirement.   
 ## (10)t_zero   
-In a waveform, t_zero is defined as a time coordinate where the absolute maximum amplitude is. It's also an injection parameter called geocent_time in geocentric reference system.       
+In a waveform, t_zero is defined as a time coordinate where the absolute maximum amplitude is. It's also an injection parameter called geocent_time in geocentric reference system. However, till now I don't think the reference frame transformation matters to VItamin analysis, since what VItamin expects is just 'y_noisy_data', instead of 'time' series.          
 ## (11)Whitening comparision   
 Problem: It looks like the amplitude of bilby whitened signal has a greater order of magnitude(10^1, which supposed to be 10^0). So I make a comparision between Hunter's whitening method and mine.    
 First, Hunter gets frequency domain noise-free signals at detector directly, instead of getting time domain signals and make Fourier transform. 
@@ -244,11 +244,16 @@ signal_time_domain= ifos[k].time_domain_strain
 # k is the ordinal number of detectors   
 signal_freq_domain = np.fft.rfft(signal_time_domain)
 ```   
-If both of 2 methods above are correct, 2 frequency domain signals they get should be the same, at least very similar.
-However, They are very different.   
-to be continued...    
+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.       
+![signal_freq_Weichangfeng_method](uploads/8e27887501d8aba9a1631c05342d6a3f/signal_freq_Weichangfeng_method.png)    
+![signal_freq_Hunter_method](uploads/c5b668283727bdc9f544f81ea23465ee/signal_freq_Hunter_method.png)    
+
+
 ## (12)VItamin: Bilby BBH waveform new test    
-In this test we get frequency domain noise-free signal at detector directly, instead of getting time domain signal and make Fourier transform.    
+Though there are some problems above, we can still test VItamin by following the way that Hunter trains it strictly. In this test we get frequency domain noise-free signals at detector directly.      
+![data_20201018](uploads/bbccc16a12c1987a302cb0a697da0ac3/data_20201018.png)    
+
 
 # 2.Data   
 ## (1)Korean merger wavform