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GKS EFFECT: Outputs SGS buffered text. Sets GKS text attributes from SGS settings.
NOTES: The 1st letter is the vertical alignment: B(OTTOM), C(ENTRE) or T(OP). The 2nd is the
horizontal alignment: L(EFT), C(ENTRE) or R(IGHT). In either case, space implies no change.
The default is ‘BL’. The alignment refers to where in the character string the nominated X,Y lies;
thus a code of ‘BL’ would place the nominated X,Y at the bottom left of the string. The terms
‘top’, ‘left’ etc. refer to the character string as seen in its conventional orientation, rather than as
actually displayed.
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