The SINEX files must conform to the SINEX Version 2.01 format standard and should
contain for one day — a session in the case of VLBI — or one week (Sunday to Saturday),
station positions, a set of EOPs for each day (offsets and rates fitted over 24-hr intervals for
polar motion, UT1 and LOD, where only VLBI provides UT1). Requested time series are daily
solutions from GNSS, session-wise from VLBI, and weekly solutions from DORIS and SLR.
IVS is highly encouraged to provide nutation offsets and quasar coordinates for future
studies by the combination centers. If the SINEX files contain a variance-covariance matrix,
all constraints applied to the solution should be given in the a priori variance-covariance
matrix