Submitted on: 12 February 2004.
Revised on: 10 April 2004.
Accepted on: 11 May 2004.
___________________Astronomy and Computing---ELSEVIER
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Submitted on: 04 March 2013.
Revised on: 29 March 2013.
Accepted on: 14 May 2013.
___________________Astronomy and Computing---ELSEVIER
Submitted on: 27 November 2004.
Revised on: 05 March 2005.
Accepted on: 24 March 2005.
___________________Astronomy and Computing---ELSEVIER
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