=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Lypyrtti            060/231 RLR(1936) is 8.7m below BM
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Lypyrtti            060/231 RLR(1936) is 8.7m below BM
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Sep-2002
A description of the sea level network in Finland can be found
in 'Operational Oceanography: Implementation at the European
and Regional scales.  2002 (pp.129-137)'.
1858 - 1913 VALUES BASED ON 1 READING PER DAY
NO BM INFORMATION BUT DATA SEEMS HOMOGENEOUS
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 16-Aug-2012
To allow the preparation of the RLR diagram for the PSMSL website the 
benchmarks have been labelled a. and b.