.cfg    All calibration data, human readable.

.gps    time (probably local, possibly UTC?), latitude, longitude, altitude (m), # of satellites, time (local?)

.o3     Raw data: time (UTC or GPS time?), ozonesonde #, cell current (uA), pump temperature (C), pump 
        current (mA), battery voltage

.ptu    time (UTC?), pressure (hPa), air temperature (C), Humidity (%RH), battery
         voltage, internal temperature (C), Tpr (C), Tu (C)

.raw    date, time (UTC?), packet (see Appendix G)

.wnd    We don't gather wind data, always empty.