The text files containing the 10 s averaged data from Missions 02-13 (August 02-
17, 1991) have a small information header.  In the information header is the
following (in order as seen in the text file):

Study Name Date
mission (one mission per day)
averaging time (10 s)
number of rows
number of columns
Beginning and End Hour (GMT)
Beginning and End Minute
Beginning and End Second
Beginning and End Latitude (degree N are positive)
Beginning and End Longitude (degrees E of Greenwich)
" " Altitude (m)
" " Presure (mbars)
" " Temperature (Celcius)
" " Dew Point (Celcius)
" " Aerosol Scattering (x10^-4 inverse meters)
" " Ozone (ppbv)
" " SO2 (ppbv)
" " NOx (ppbv)
" " NOx (ppbv)
" " CO (ppbv)
" " CO2 (ppmv)
" " ASASP Aerosol total number density, #/cc (0.1-3 microns)
" " FSSP Aerosol total number density, #/vol (3-47 microns)--uncorrected
" " MFM1 Mass flow meter for pump drawing air for inorganic aerosol filter
" " MFM2 Mass flow meter for pump drawing air for organic aerosol filter
" " PSP Top (W/m^2); upward looking radiometer (broadband, shortwave radiation)
" " PSP Bottom (W/m^2); downward looking radiometer (broadband, shortwave rad.)
" " PIR Top (W/m^2); upward looking radiometer (broadband, longwave radiation)
" " PIR Bottom (W/m^2); downward looking radiometer (broadband, longwave rad.)
" " CCN (cloud condensation nuclei counter at 0.7% humidity).

NOTE: all data instruments and method of detection used by each are listed in the
"Experiment Design" documentation (see attached).

Columns of data follow this header.  The column number is equal to the
sequence listed in the header starting with Hour GMT (e.g., the first
column is the hour variable, the second is the minute, etc..).  The number
of rows are the number of data points in the 10 s averaged file.

The number -99.00 is the real number used to indicate no data. However, CO2
data is often just a constant number(e.g., 151 throughout Mission 02) for
the entire mission.  This is equivalent to -99.00 in this case.  It was just
not corrected to list a -99.00.  Also, the integer -99 is equivalent to -99.00. 

The first column of NOx data is for an instrument that was not working properly.
It is the O3 chemiluminescence detection NOx instrument; due to the malfunction of
this instrument, the luminox NOx instrument was set to NO+NO2 mode to detect NOx.
It is my suggestion that you remove the first column of NOx data corresponding to
the O3 chemiluminescence detection NOx instrument.  The columns is not also
changed to -99, but even when values are listed they do not appear to be accurate.

The data for the CO2 instrument are reliable for missions 04,05,06,09 and 10.
Disregard the other missions' data for CO2.  The data is believed to be 
faulty even when no -99 is listed for the data except for the missions listed
above.

FSSP total number and ASASP total number density is a summation of the 15
channels of each instrument.  Each channel is for a certain size, but this
file only lists the total number density in the size range of all the bins.
FSSP, however, must be corrected.  The correct value for FSSP is calculated by
dividing FSSP by 36.7.  This gives the value in #/cc similiar to ASASP units.
The correction is needed to account for aircraft speed (e.g., air flow) and intake
area.

The radiometers are broadband which means they cover a wide range of wavelengths of 
radiation.  PSP covers UV and visible while the PIR measured infared radiation
The radiometer data is not corrected for the pitch and roll of the aircraft
The necessary information to correct for the aircraft attitude will be 
included in the 1s data files.  My work has suggested that the correction is largely
unecessary except when the G-1 was banking into a turn, which generally occured
outside the plume (e.g., necessary to get an accurate background reading).

Scott Smyth, Battelle  11/5/92