Subsurface Modifier

I am using the Mirror and then when I use the subsurface modifier then the area where the mirror joins there is a dip in where it connects. Has anyone seen how to fix this? Thanks

In the mirror modifier you have clipping and merge settings. Ensure the merge value is enabled and with a sufficient value to merge the centre points
http://wiki.blender.org/index.php/Doc:2.6/Manual/Modifiers/Generate/Mirror

Ensure you have no faces inside your mirrored mesh

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