Mm - hmm.
Yeah.
Yeah.
Mm - hmm. OK. Well , maybe it 's not a big deal. But , um  Anyway , that was just something we wondered about. But , um , uh , certainly a lot of the noise , uh , is , uh , below a hundred hertz. Uh , the signal - to - noise ratio , you know , looks a fair amount better if you  if you high - pass filter it from this room.