The 3m profile sonic is doing double duty as a profile sonic and also sonic 13b in the horizontal array.  Steve made a y cable to connect this sonic to both profile S2 and downwind2 S10.

11/23/09, TWH: It appears from the 5-minute covars that the connection of the 3m profile sonic to Serial channel 10 on the downwind2 adam was made around 09:30 on July 21.