Precise ephemerides

From: Zoran <zorant_BRISI_@xxxxxxxxxxxxxxx>
Date: Tue, 27 Jan 2009 15:29:46 +0100

Hello

When i looking for broadcast ephemerides I go there:
ftp://cddis.gsfc.nasa.gov/pub/gps/data/daily/2009/ day 09n
and get brdcddd0.yyn.Z
ddd-day of year
yy-year

what mean this n after 09?
and what are this folder
09d
09g
09m
09o
09s
and where I can found precise ephemerides (sp3)?
Thank you for answer!

Makni _BRISI_ iz mail adrese
.

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