reducing space taken up by TimeSignature

[Kieren MacMillan]

Hello, all --

What is the best way to reduce the space taken up by a TimeSignature?
e.g., to reduce or eliminate the space "under" each TS in the  
attached example

I tried setting #'space-alist [e.g. first-note, etc.], but got lots  
of errors...  =(

Thanks,
Kieren.

_____________________________________________

%%%  CODE SNIPPET BEGINS
\version "2.8.4"

\layout
{
        \context
        {
                \Staff
                \revert TimeSignature #'stencil
                \override TimeSignature #'font-size = #2
                \override TimeSignature #'extra-offset = #'(0 . 7)
        }
}

\relative c'
{
        c4 c c c
        \time 3/4 c c c
        \time 3/2 c c c c c c
        \time 4/4 c c c c
}
%%%  CODE SNIPPET ENDS