1896 - 1936 MSL values based upon integration of continuous record
1937 - 1961 Values based on 24 readings a day
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-JUN-91 :
Nedre Gavle         050/171 RLR(1964) is 10.0m below BM No fix 451
Nedre Gavle is an historic station last data 1986

