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EPHEMERIS table columns:

HEADER

(String) Full header of original IGS-SP3 file.

MJD

(Int) MJD for which ephemeris are given.

INTERVAL

(Float) sampling time, in seconds.

SVN

(Vector<Int>) vector of satellite IDs.

ORBIT_ERROR

(Vector<Int>) orbital error indicators, per each SVN.

MJD_FRAC

(Vector<Double>) epoch of each sample (fractional day).

X, Y, Z

(Matrix<Double>) actual ephemeris. The rows of each matrix correspond to samples, the columns to sattellites.