How to align bar numbers to the center of a measure?

[Francesco Napoleoni]

Hi all

I would like to have bar numbers printed below the last staff of a system, 
aligned to the middle point between bars, like the image attached. In the 
notation manual I see that BarNumber object can be configured in many ways, but 
I still can’t figure out whether such positioning and alignment is feasible.

Any ideas? or RTFM pointers? ;-)

Thanks
Francesco Napoleoni

bar_numbers.png
Description: PNG image