text spanner to short

[Stefan Thomas]

Dear lilypond users,
in the below quoted file, the end of the text spanner is a little bit to early, in my opinion. What can I do, to move it a little to the right?
Thanks for Your help
Stefan

mute = {\textSpannerUp \override TextSpanner #'bound-details #'left #'text = \markup {\italic "mute" } \override TextSpanner #'style = #'dashed-line \override TextSpanner #'dash-period = #0.01 \override TextSpanner #'bound-details #'right #'text = \markup { \draw-line #'(0 . -1) } }

 \relative
{ \mute d\startTextSpan e f e d2\stopTextSpan c1 }