numeric
Three pixel limits indicating how text should be drawn within graphic_window. During display of a text primitive (glabel or gtext) the values are interpreted thus:
If the text height is >= .greek[1] the text is displayed in full, otherwise if the text height is >= .greek[2] the text is displayed as a 2-D box, otherwise if the text height is >= .greek[3] the text is displayed as a single vector, otherwise the text is not drawn at all.
For new windows, the .greek values are 0,0,0 implying that text items should be drawn in full.
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