It's hard to say without seeing the data.  It could be the data, it could
be the starting values, it could be the model choice.

Jean


On Wed, Jun 19, 2013 at 10:45 AM, pakoun <pkount@bgc-jena.mpg.de> wrote:

> Yes it should look like that... what i am doing is a variogram fit . But
> the
> data of course are spread almost all over.. I would guess might be problem
> with the data only?
>
>
>
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