HDR Header
VER Software version
NOW UTC time at which the data set was processed
RNX Name of RINEX file processed
MOD Processing mode: static or kinematic
BEG Beginning of processed data in RINEX file
END End of processed data in RINEX file
INT Interval of data processing
EPO #epochs processed #epochs tried to be processed #epochs expected in the RINEX file in the time interval
EXE Processing time
OBS Observables processed for each system
PAR Parameters estimated in the PPP filter
    TYPE  Type of parameter
    SYS   GNSS for which this parameter applies (blank means all GNSS)
    SIG   Signal for which this parameter applies (blank means all GNSS)
    SAT   Satellite for which this parameter applies (ALL means all satellites for this GNSS and signal)
    INIT  Initial constraint put on the parameter in the PPP filter
    NOISE Process noise put on the parameter in the PPP filter
SP3 SP3 (precise satellite orbits) files
CLK CLK (precise satellite clocks) files
ERP ERP (Earth rotation parameters) files
ATX ANTEX (phase-center corrections) file
DCB Differential code bias (DCB) or Bias SINEX files
GIM Global Ionospheric Map (GIM) files
VMF Vienna Mapping Function 1 (VMF1) grid files (tropospheric correction)
ELV Elevation mask (degrees)
TZD A priori tropospheric model applied
REC Receiver type (as read from the RINEX file)
ANT Antenna type (as read from the RINEX file)
ARP Antenna reference point (north, east, up) (as read from the RINEX file)
PCO Phase center offsets for the user antenna for each frequency (as read from the ANTEX file)
OTL Ocean Tide Loading coefficients
YAW Periods where satellites are in eclipse: PRN START_TIME END_TIME TYPE_OF_ECLIPSE BETA_ANGLE SATELLITE_TYPE
IAR Integer Ambiguity Resolution: percentage of ambiguities fixed
AVF A posteriori Variance Factor used to scale the covariance matrix
APR Source of the a priori coordinates
ELL Ellipsoid used for (x,y,z) to (lat,lon,h) transformation
POS Information on the a priori and estimated coordinates
    CRD           Coordinate type
    SYST          Reference system
    EPOCH         Epoch of the coordinates
    A_PRIORI      A priori coordinates
    ESTIMATED*    Estimated coordinates
    DIFF*         Differences (m) between the estimated and a priori coordinates
    SIG_PPP(95%)* Standard deviation (95%) (m) of the PPP estimated coordinates
    SIG_TOT(95%)† Total standard deviation (95%) (m)
    CORRELATIONS* Correlations matrix of the estimated coordinates
PRJ UTM* and MTM** projections
OHT Orthometric height***
GHT Geoid height***
VLM Velocity model used for epoch transformation 
OFF Receiver clock offset at the last epoch and its standard deviation
DRI Approximate clock drift (ns/day)
RES Root-mean-square of the residuals for each signal, and classification per elevation (ELV)
FLG Additional information on each satellite
    PRN Satellite PRN
    EPO Number of epochs where the satellite is used in the PPP solution
    TRK Number of epochs where the satellite is rejected due to missing observations (tracking issues)
    CLK Number of epochs where the satellite is rejected due to missing satellite clock corrections
    EPH Number of epochs where the satellite is rejected due to missing ephemeris (orbit) corrections
    ELV Number of epochs where the satellite is rejected due to elevation angle below cutoff angle
    YAW Number of epochs where the satellite is rejected due to satellite yaw manoeuver (eclipse)
    DCB Number of epochs where an observation is rejected due to missing DCB corrections
    SLP Number of cycle slips detected
    MIS Number of epochs where an observation is rejected due to blunders detected in the misclosure vector
    RES Number of epochs where an observation is rejected due to a large residual

(*) Only for Static mode
(†) Only when epoch transformation is applied. Total standard deviation incorporates both PPP and epoch transformation uncertainties
(**) Only for Static if user selects NAD83(CSRS) as the reference frame and the estimated position is in Canada
(***) Only for Static if the estimated position is within in the Geoid model