How do you handle variables with unlimited dimensions

It is not clear to me how to handle such variablesboth reading and
wrting, thanx
gaby
-- 
***************************************************************
**     Gabriella Turek               g.turek@xxxxxxxxxx      **
** National Institute of Water & Atmospheric Research (NIWA) **
** PO Box 8602 Christchurch New Zealand +64-3-348-8987x3724  **
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