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These files contain Alexander Tall Tower! 10 minute data that have been 
quality controlled using our interactive IDL programs. The files are 
labelled with a three letter code to indicate the station, the year, the 
month, the frequency of the data, and the observing level on the tower 
(IIIYYYYMMq101.txt for 10 minute data at Level 1).

The files are numbered by level on Alexander Tall Tower!, where: 
Level 1: 30 m
Level 2: 15 m
Level 3: 7.5 m
Level 4: 4 m
Level 5: 2 m
Level 6: 1 m

There is a two line header that gives the year, month, 3 letter ID, Argos ID,
and station name in the first line and latitude, longitude, and elevation in
the second line.

The columns are as follows:

1     Year
2     Julian day
3     Month
4     Day
5     Ten minute observation time (UTC)
6     Temperature (C)
7     Pressure (hPa)
8     Wind Speed (m/s)
9     Wind Direction
10    Relative Humidity (%)
11    Delta-T (C)