layout of markup text

[Peter Gentry]

My problem is illustrated in

 

\version "2.19.81"

\relative c'' {

\clef "treble"

\time 2/4

\key c\major

r16  f16 (  [  a16 c16 ]  bes16 )  [  f16 (  bes16 d16 )  ]   |  % 64

R1*2/4*2 \startTextSpan

  ^\markup { \small \italic "flt1 Solo ad lib"}

 a8\stopTextSpan ^\markup {\large \italic "DC al Fine"}  r8\fermata 

 r4  \bar "|."}

 

I want the text” flt1 Solo ad lib” to be centred in the textspan. I cannot find the appropriate syntax and any leading blanks are ignored.

 

I’m sure there is a simple solution but it escapes me – thanks in advance for any assistance.

 

Peter