series of up'n'down bows: /\\//\\/

[user28]

hello,
http://old.nabble.com/file/p26295691/1.jpg 

now i can write single bow marks:
a^\markup {\musicglyph #"scripts.upbow"}
a^\markup {\rotate #180 \musicglyph #"scripts.upbow"}

and series:
a^\markup {\musicglyph #"scripts.upbow" \rotate #180 \musicglyph
#"scripts.upbow"}

but when each note have a mark, they superpose each other and some of them
printed on the top, other shifted.
http://old.nabble.com/file/p26295691/2.png 
is it possible to make they more compact?

\version "2.12.2"
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