virtual variable in LAS

[Zhangfan Xing <xing@xxxxxxxxxxxxxxxxxxxx>]

Jon and friends,

I am trying to create virtual variables with LAS, but get this error:

No 'url' attribute specified for 'var' element at Ferret.pl line 82

The faq http://ferret.wrc.noaa.gov/Ferret/LAS/FAQ/virtual_variables.html
was followed.

My test site is http://eyre.jpl.nasa.gov/try
Please check for "u v diff" under first dataset "Assimilation (Adjoint)".

The *.xml and *.jnl files were posted at
http://eyre.jpl.nasa.gov/download/for-jon/

Thanks,

Zhangfan