"Long" fermata above two notes

[luciosilla]

Hello,
I've been trying to typeset a piece of music that has a "Long" fermata above
two notes.
It is used sometimes to indicate the place where the soloist should play the 
cadenza in a concerto. http://old.nabble.com/file/p27480522/Fermata11.bmp 
Does anyone have any hints on how to typeset this? 

Thanks,
Lucio
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