The low - frequency cut - off.
Do you remember the  ? Oh , yeah. So that was  that was , uh  that one I can claim credit for , uh , i in terms of screwing it up in the first place. So that someone e until someone else fixed it , which is that , um , I never put  when I u We had some problems before with offsets. This inf this went back to , uh , I think Wall Street Journal.
Hmm.
So we  we had , uh  ea everybody else who was doing Wall Street Journal knew that there were big DC offsets in th in these data  in those data and  and  and nobody happened to mention it to us ,