+ (PhrasingSlur . (
+ (molecule-callback . ,Slur::brew_molecule)
+ (thickness . 1.2)
+ (spacing-procedure . ,Slur::set_spacing_rods)
+ (minimum-length . 1.5)
+ (after-line-breaking-callback . ,Slur::after_line_breaking)
+ (extremity-rules . ,default-slur-extremity-rules)
+ (extremity-offset-alist . ,default-phrasing-slur-extremity-offset-alist)
+ (de-uglify-parameters . ( 1.5 0.8 -2.0))
+ (Y-extent-callback . ,Slur::height)
+ (details . ((height-limit . 2.0) (ratio . 0.333) (force-blowfit . 0.5)
+ (bezier-pct-c0 . -0.2) (bezier-pct-c3 . 0.000006)
+ (bezier-pct-out-max . 0.8) (bezier-pct-in-max . 1.2)
+ (bezier-area-steps . 1.0)))
+ (beautiful . 0.5)
+ (y-free . 0.75)
+ (attachment . (#f . #f))
+ (attachment-offset . ((0 . 0) . (0 . 0)))
+ (slope-limit . 0.8)
+ (meta . ,(grob-description "PhrasingSlur" slur-interface))
+ ))