; For each satellite orbit going from north to south overpass data are identified using 
; a collocation radius of 300 km. From all collocations for a given orbit the  mean total ozone 
; is calculated. At high latitudes more than one orbit may pass a site, so that more than one 
; value may be provided for a given day, For questions contact mark.weber@uni-bremen.de  
;
; Typical overpass file name, e.g GO099HOH.dat, for overpass data is SSNNNMMM.dat with 
; SS=GO (GOME) or SS=SC (SCIAMACHY), NNN=WOUDC station number, MMM=abbreviation for WOUDC 
; location, e.g. HOH for Hohenpeissenberg.
;
; column 1: UTC overpass date [yyyymmdd]    
; column 2: UTC overpass time [hhmmss]
; column 3: mean latitude [degs] of all oeverpass data
; column 4: mean longitude  [degs] of all overpass data
; column 5: mean SZA [degs] of all overpass data
; column 6: mean distance [km] of all satellite ground pixels within 300 km
; column 7: mean scene height [m] of all satellite ground pixels 
; column 8: mean satellite total ozone [DU] of all collocated data 
; column 9: number of collocated satellite ground pixels during overpass
;
; sample output:
;
; 19950628 095907  47.8   11.3  28.6  130   785  303.8  15
; 19950630 103605  47.9   10.6  26.5  135   868  317.8  15
; 19950701 100453  47.8    9.8  28.5  185   753  321.0  23
;