Zuheir, What you write is certainly correct but I still think that known offsets should be used rather than estimated. I still don't understand how to proceed with the SINEX/DISCONTINUITY block. Should we include this block containing infos about all stations with discontinuities in every single of the 3500+ SINEX files even if a station has not participated in the respective session? Or sould this block be kept in a separate file and stored somewhere for general access? Where will the known displacements be made available to the public? TSUKUB32, DSS65, Medicina and Eflsberg have undergone track repairs (which other fixed station do you refer to?). If you deem appropriate please issue new DOMES numbers for these sites. We will then use them in the future. Regards, Axel -- ------------------------------------------------------------------------------------------ Axel Nothnagel nothnagel@uni-bonn.de Geodetic Institute of the University of Bonn Nussallee 17 Tel.: +49-228-733574 53115 Bonn Fax.: +49-228-732988 Germany