+/**
+ Get the measure wide constant for arithmetic spacing.
+
+ @see
+ John S. Gourlay. ``Spacing a Line of Music,'' Technical Report
+ OSU-CISRC-10/87-TR35, Department of Computer and Information Science,
+ The Ohio State University, 1987.
+
+ */
+Real
+Spacing_spanner::get_duration_space (Moment d, Moment shortest) const
+{
+ Real log = log_2 (Moment (1,8) <? shortest);
+ Real k= paper_l ()->get_var ("arithmetic_basicspace")
+ - log;
+
+ return (log_2 (d) + k) * paper_l ()->get_var ("arithmetic_multiplier");
+}
+
+