The data are in a 3-dimensional matrix. The indeces are:
Height index, date index, variable index
The heights are 
[10, 28, 38, 69, 100, 149] m above ground level
The variables are:
1 datenum 
2 u (horizontal mean wind) 
3 w (vertical mean wind) 
4 direction 
5 std_u 
6 npack (number of packets in the average) 
7 rpack (signal to noise level)