File:   00readme_4_orbits

This directory /pub/slr/products/orbits contains the satellite state vectors  
produced weekly by the ILRS Analysis Centers and Combination Centers for 
the two LAGEOS and the two ETALON satellites.
Their are computed using the data collected over the past 7 days and
their reference frame is the Earth Centered - Earth Fixed (ECEF) realized 
by SLRF2008 and the IERS Bulletin A EOP series (USNO). 
Modeling information on the individual "xxx" AC is detailed in the 
corresponding README_AC.xxx files

These results are archived in subdirectories "sat"/"YYMMDD",
where "sat" is the satellite (lageos1, lageos2, etalon1, etalon2) 
and "YYMMDD" is the date (YY=2 digit year, MM=2 digit month, and 
DD=2 digit day) of the end of each 7-day interval spanned by the orbit. 
Within each subdirectory you will find the two combined solutions 
and the corresponding summary files. 

The naming convention is explained in:

 ftp://cddis.gsfc.nasa.gov/slr/products/00readme

More information on the ILRS products can be found at:

 http://ilrs.gsfc.nasa.gov/products_formats_procedures/products.html

For more information and/or suggestions, please contact the CDDIS/EDC
Data Center representatives (Carey Noll, carey.noll@nasa.gov and
Christian Schwatke, christian.schwatke@tum.de) or the ILRS Analysis 
representatives, Erricos C. Pavlis <epavlis@umbc.edu> and Cinzia Luceri 
<cinzia.luceri@e-geos.it>.