Adjusting slur lines?

[Michael Lakes]

I was wondering if it's possible to adjust the slur lines a little higher.  
In the example below, the slur is a little to low, is it possible to move 
the slur line up?  Like a padding property of sorts?

Thanks

%version 2.2.2
\score {
        \new staff{
        \notes {
                \time 6/8
                \override Slur #'attachment = #'(head . head)
                \relative c'''{a8 b c d \acciaccatura f8 e a r4. r4. r4. r4. 
r4. r4.}
        }
}
}

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