then there 's amplification afterwards. And you can get , I think it was  I think it was in the  Wall Street Journal data that  that  I can't remember , one of the DARPA things. There was this big DC - DC offset
Mm - hmm.
we didn't  we didn't know about for a while , while we were  messing with it. And we were getting these terrible results. And then we were talking to somebody and they said , " Oh , yeah. Didn't you know ? Everybody knows that. There 's all this DC offset in th " So , yes. You can have DC offset in the data.
Oh , OK.