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Two-dimensional offsets (X and Y coordinates) are stored as pairs.
car of the offset is the X coordinate, and the
the Y coordinate.
\override TextScript.extra-offset = #'(1 . 2)
This assigns the pair
(1 . 2) to the
property of the
TextScript object. These numbers are measured in staff-spaces, so
this command moves the object 1 staff space to the right, and 2 spaces up.
Procedures for working with offsets are found in scm/lily-library.scm.