redifine mesh locally in cst

Hello everybody,
I'm doing some simulations on plamonic nanoantennas. I'm starting from an already done simulation.
Here is the link : https://www.cst.com/Applications/Art...WAVE-STUDIOReg.

I try to define a local mesh on the spheres. but, in contrast to the article, the mesh is uniform around all the spheres, and near the gap. Instead I want a "gradient" in the dimension of the mesh, in order to have a better resolution around the gap. In attachment there is the comparison between my mesh (left) and the one obtained in the cst example (right) . Any idea on how to get the same result?

Thank You

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