dashed \draw-line

[Kevin Patrick Barry]

Dear LilyPond users,

I would like the markup function \draw-line to produce a dashed line, but I can't find it in the internals reference to see what overrides to use.  I tried TextScript #'style, Glissando #'style and \tweak #'style.  I'm just fumbling in the dark really; none of the grobs involving lines seem to be it, and the spanner documentation doesn't tell me which either.  Perhaps there's some way to change the line-spanner-interface?  

Thanks in advance,

Kevin Barry