Mismatched field header information in TMY3 weather data?

hi, I was looking at the whether data packaged with the SAM model installation. I use the "USA AZ Phoenix Sky Harbor Intl Ap (TMY3).csv" as an example, the data filed including a column called "TWet" which is different from the corresponding data column (called Tdew) in "USA AZ Phoenix (TMY2).csv". I did some more research in the TMY3 user manual, and in Table 1-3, it has data fields related to Dew Point but no data fields related to wet-bulb temperature. I am wondering if the 'Twet' heading in the TMY3 files actually should be Tdew. Thank you.

Source Location ID City State Country Latitude Longitude Time Zone Elevation
TMY3 722780 Phoenix Sky Harbor Intl Ap AZ USA 33.45 -111.983 -7 337
Year Month Day Hour GHI DNI DHI Tdry Twet RH Pres Wspd Wdir Albedo
2002 1 1 0 0 0 0 10 5.6 74 977 1.5 110 0.2
2002 1 1 1 0 0 0 8.9 5.6 80 977 2.1 200 0.2