SONLatestTime

  SONLATESTTIME is used to flush data to disk

  FLAG=SONLATESTTIME(FH, CHAN, STIME)
  where FH is the SON file handle, Chan is the channel, and STIME is the
  latest valid time in clock ticks

  See CED documentaion

  Author:Malcolm Lidierth
  Matlab SON library:
  Copyright © The Author & King's College London 2005-2006