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Submitted on: 15 July 2001.
Revised on: 07 October 2001.
Accepted on: 21 November 2001.
___________________Journal of Operational Oceanography
Submitted on: 27 January 2019.
Revised on: 26 March 2019.
Accepted on: 17 April 2019.
___________________Journal of Operational Oceanography
Submitted on: 28 July 2007.
Revised on: 12 October 2007.
Accepted on: 10 November 2007.
___________________Journal of Operational Oceanography
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