I just noticed that, as well as correcting the transcription of Message 4, David Levine has informed us that the message is coming in on the 21-cm wavelength. This comports very nicely with Mr. Neylon's calculation of the '!@!' unit of distance being .21 meters, doesn't it? Working forward from the 21-cm wavelength as the unit of length, and from .492 seconds as the time unit, and correcting my original calculations (I was off by 90,000 in my conversion to decimal), I find that the very large number given by the TCs, when multiplied by .21 meters and divided by .492 seconds comes to 300,000,000 (and change) meters/second.