This describes the contents of the o3_*_theta.ascii files in this directory.
o3_eqlat_theta.ascii contains the seasonal mean O3 presented in Strahan 
"Climatologies of lower stratospheric NOy and O3 and Correlations with N2O based 
on in situ observations" (JGR, in press, 1999).  

'o3_lat_theta.ascii' uses a latitude and potential temperature coordinate. 

There are four seasons labelled: DJF (Dec-Jan-Feb)
                                 MAM (Mar-Apr-May)
                                 JJA (Jun-Jul-Aug)
                                 SON (Sep-Oct-Nov)

The latitude value is next to the season. Equivalent Latitudes run from -90 to 90,
incremented by 2 degrees. Latitudes are -72 to 90, incremented by 2 degrees. After 
the season and latitude are 5 lines of NOy mixing ratios in ppb. These are the 35 
potential temperature values, running from 360 to 530 K, increments of 5 K. 
Missing values are '9999.'.

The color post script file in this directory is Plate 5 of that paper (seasonal mean
O3 in equivalent latitude).