[MGS] Here's a nasty-ish hack to make labels with vertical text. Not rotated text, just with the letters stacked on top of each other. For spaces, you need to insert two newlines.

  label .l -text "Vertical\n\nLabel" -wraplength 1
  pack  .l

Make sure the label is packed/gridded so as not to expand or fill horizontally.

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[Mark G. Saye]