Hi:
      Thank you in advance.
      I have two simple question:
     1.In the grc,i see a block: header_payload_demux  
      It has 3 input:in,trigger,header_data.But i see the 
header_payload_demux_impl.cc:iosignature::make2(1,2,..,..).But it has 3 
input,why?
     Thank you.
     2.fft:I see the shift:yes.
      I want to save the symbol to file sink and analyse by matlab.But now i 
don't know it's shift earlier or fft earlier?
     Thank you.
Best regards,
xianda
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