=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 05-May-1994 UP TO 1993 (JULY) OTT GAUGE, SINCE 1993 (AUGUST) SONAR RESEARCH GAUGE =========================== FOLLOWING PSMSL DOCUMENTATION ADDED 13-Mar-2002 Marjan data Dec. 1994-Dec. 1995 suspect (shows doubling in range) and deleted.