The EXtended Standard Product 3 Orbit Format (SP3-c) (17 August 2010) Steve Hilla National Geodetic Survey National Ocean Service, NOAA Silver Spring, MD 20910-6233, USA INTRODUCTION The original S......information at each epoch (for X, Y, Z, and satellite clock correction)...deviation of each position component (X, Y, and Z) at that epoch, in millimeters...