COHERENS sigma to meters z coordinate

[Francisco J Campuzano Guillen <G.F.Campuzano@xxxxxxxxxx>]

Hello Ferret users:

This is my first message to the list, I recently started to use this 
software because of the need to represent the NETCDF results from the 
COHERENS (Coupled Hydrodynamical-Ecological Model for Regional and 
Shelf Seas) model.
At this moment, I'm starting to experiment with the test cases that 
comes included in the CD-ROM, and trying to represent the same 
diagrams as they did in the COHERENS User's Guide(where depths are 
represented in meters),and here is where my doubt comes: 
How can I represent with the FERRET package the vertical coordinate in
meters instead of sigma-coordinated (I'm using the version 5.41 for 
win32 (so -gui mode is not supported))?.Although I can use the data in
the default sigma coordinates,the outcomes when I SET DATA are:

*** NOTE: Units on axis "z" are not recognized: sigma_level
*** NOTE: They will not be convertible


I know it is possibly a quite simple question, but I have been looking
through the FERRET USERGUIDE and couldn't find the solution, if you 
need any other details please ask.Thank you very much in advance your 
help.Yours sincerely:

			Francisco Javier Campuzano Guillén


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Francisco J Campuzano Guillén
Email: G.F.Campuzano@hull.ac.uk
University of Hull