Citizen Systems PPU-231II - Manual (Page 56)

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• If characters of different vertical magnification are contained
in a line, the baseline of each character is lined up.
• Horizontal and vertical magnification can also be specified/
canceled by ESC !.
The ESC ! or GS ! command, whichever is handled last,
becomes effective.
[Default] n = 0
[See Also] ESC !