\markup {
   \line {
     \scale #'(3 . 1)
     Mirror
     \scale #'(3 . -1)
     Mirror }
}

How about

\markup \override-lines #'(baseline-skip . 0.0) {
  \column {
    \scale #'(3 . 1)
    Mirror
    \scale #'(3 . -1)
    Mirror
  }
}

Kind regards,
Michael
--
 Michael Gerdau       email: m...@qata.de
 GPG-keys available on request or at public keyserver

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