[Users] Reduction in slices?

[Francisco Guzman]

Dear all, 

Assume I have a thorn mounted on Carpet, completely unrelated to any GR thorn (say my_wavetoy) . 

Is there a way to estimate the integral of a grid function on every slice of z=constant? 

This reminds me the outflow thorn that is capable of estimating the integral of fluxes (grid functions) across a spherical surface. 

I wonder whether there is something similar to integrate a flux (a given grid function of my choice) across z=constant planes: 

- perhaps a reduction operator from Carpet 
- a similar thorn to outflow 

Thanks in advance, 
Francisco 

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