Line between fingerings

[Thomas Scharkowski]

Hi list,

sometimes I want a line between two fingering numbers to show the 
direction of a position shift.
I use \postscript to achieve this:

--
\version "2.13.13"
{
  c''2-1-\markup { \postscript #"2.0 6.0 moveto 1.3 0.5 rlineto stroke" 
} a''-1
}
--


Any hints for an easier way?

Thank you
Thomas