Submitted on: 29 May 2004.
Revised on: 26 July 2004.
Accepted on: 27 August 2004.
___________________ASTRONOMY & GEOPHYSICS---OXFORD UNIV PRESS
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Submitted on: 17 January 2016.
Revised on: 24 February 2016.
Accepted on: 15 April 2016.
___________________ASTRONOMY & GEOPHYSICS---OXFORD UNIV PRESS
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Submitted on: 25 December 2012.
Revised on: 06 February 2013.
Accepted on: 25 February 2013.
___________________ASTRONOMY & GEOPHYSICS---OXFORD UNIV PRESS
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