This directory contains IGb08 nnr and nf orbits and clocks, but with xfiles
that translate from frame of date to IGS14 instead of IGb08.

To correctly process a station into IGS14 using these files:
1.) process a rinex file using the flinnR_nf or flinnR_nnr modes (gd2p) for 
    -orb_clk with "-prodType [nf|nnr]" (gd2e) and the -stacov or -gdcov options
    For this processing, one should use the IGb08 antex files for consistency
    with the orbit and clock products.  This process will produce a stacov/gdcov
    in the frame of date for the nf or nnr orbit and clock products
2.) convert the stacov/gdcov from frame-of-date to IGS14 using the xfiles
    contained in this directory using "apply" (GIPSY-OASIS) or netApply.py 
    (GipsyX)

Users who have retained their original stacovs from nf or nnr runs only need
to perform step 2.

The table below records the average fidelity to the ITRF 2014 of daily PPP on 
~60 stations over six months (in mm):

NNR
                       X             Y             Z
Repro2.1     2.3 +/- 1.8   1.6 +/- 2.3   3.2 +/- 2.3
Repro2.1b    0.0 +/- 1.7  -0.0 +/- 2.4   1.1 +/- 2.7
Repro3.0     0.4 +/- 2.5   0.1 +/- 3.0   0.7 +/- 2.9
NF    
                       X             Y             Z
Repro2.1     2.3 +/- 1.9   1.6 +/- 2.3   3.3 +/- 2.3
Repro2.1b    0.1 +/- 1.8  -0.1 +/- 2.3   1.1 +/- 2.7
Repro3.0     0.2 +/- 2.5   0.1 +/- 3.0   0.7 +/- 3.0  

Repro2.1 was done using the orbits, clocks, and xfiles in:
ftp://sideshow.jpl.nasa.gov/pub/JPL_GPS_Products_IGb08/Final

Repro2.1b was done using those from this current directory.

Repro3.0 was done using those from:
ftp://sideshow.jpl.nasa.gov/pub/JPL_GPS_Products/Final