how to stretch the bar width?

[Federico Bruni]

Hi,

I'm sure this has been asked before, but I couldn't find anything in the 
archives.  Guess I'm using the wrong keywords.

I'm writing a legenda for tablature and I'm using \markup over each bar 
to explain the notation.
As you can see in the attached example, the markup blocks are moved 
vertically to avoid collisions.  I'd like to stretch the bars so that 
there's enough room for markup.

I don't want to use spacer rests.
Any advice is welcome.

Thanks,
Federico

tablature-legenda.ly
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