In order to take advantage of these new developments, the ITRS Center, together with the
ITRF CCs, is planning to generate a new ITRF solution (ITRF2013) and solicits input from
the IERS Technique Centers (TCs). The TCs are requested to provide time series that are as
long as possible and preferably covering the full history of observations of each technique,
such as for instance VLBI and SLR data since the eighties.