Submitted on: 02 March 1998.
Revised on: 13 May 1998.
Accepted on: 04 July 1998.
___________________ASTRONOMY & GEOPHYSICS---OXFORD UNIV PRESS
Submitted on: 22 June 1999.
Revised on: 02 August 1999.
Accepted on: 06 September 1999.
___________________ASTRONOMY & GEOPHYSICS---OXFORD UNIV PRESS
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Submitted on: 20 December 2024.
Revised on: 31 March 2025.
Accepted on: 19 April 2025.
___________________ASTRONOMY & GEOPHYSICS---OXFORD UNIV PRESS
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Submitted on: 25 February 2023.
Revised on: 17 March 2023.
Accepted on: 07 April 2023.
___________________ASTRONOMY & GEOPHYSICS---OXFORD UNIV PRESS