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/usr/share/psychtoolbox-3/PsychRects/RectTop.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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function top = RectTop
% yTop = rect(RectTop)
% 
% RectTop returns the rect index of yTop.
% Also see PsychRects.

% 5/12/96 dgp wrote it.
% 2/25/97 dgp changed to agree with Apple's rects

top = 2;