Figured bass: "blank" extender

[flup2]

Hello,

I'm trying to achieve this result:
<http://lilypond.1069038.n5.nabble.com/file/n174360/figured_543.png> 

The problem is to have the "3" at the same height of the 4, but blank space
above it. 

I tried to include an empty markup above the "3", but it didn't work.
Another idea would be to "blank" the extender.

Has someone an idea, or another solution?



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