Avoid zero level contour

[Francesc Pastor Guzman <paco@xxxxxxxxxxxxx>]

     Hi ferreters

   I want to plot the topography on a ferret plot, I use contour to do it. But ferret draws the zero level contour, in part over the sea.
Is it posible to tell ferret not to draw this contour?

    Thanks in advance


Francesc Pastor Guzman
Fundacion CEAM, Spain
Tel. : 34 96 131 82 27,  Fax.: 34 96 131 81 90                                                
E-mail :  paco@hp715.ceam.es, paco@ceam.es                                              
http://www.gva.es/ceam