=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Apr-1998
data for 1990-94 revised with values in dataset received in April 1998
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 18-Feb-2003
Data for 1997 were replaced by the data from University
of Hawaii.
Data for 1998-2002 are obtained from University of Hawaii.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 22-Jan-2008
Data for the period 2003-2006 was downloaded from UHSLC
The values were corrected for the Hawaii adjusted offset.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 16-Feb-2012
There is what appears to be substantial rise in the plot for Xi Sha for the
period Jul-Dec 2010. Although the data has been 'buddy checked' with other
neighbouring stations because of its relatively remote position it is difficult
to establish when the phenomenon is real or not.