-c4^\markup{ \center-align { on three lines } }
-c4^\markup{ \center-align { "all one line" } }
-c4^\markup{ \center-align { { on three lines } } }
-c4^\markup{ \center-align { \line { on one line } } }
+c4^\markup{ \center-column { on three lines } }
+c4^\markup{ \center-column { "all one line" } }
+c4^\markup{ \center-column { { on three lines } } }
+c4^\markup{ \center-column { \line { on one line } } }