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The argument of the framingRatio: message sent to the top pane is a
rectangle instance. The upper-left corner of the rectangle is a point with
fractional x and y values. Those fractions determine where
the upper-left corner of the top pane lies relative to the left edge and
top of your screen. The lower-right corner of the rectangle is
a point with fractional x and y values that determine where
the lower-right corner of the top pane lies relative to the left edge
and top of your screen.
Similarly, the argument of the framingRatio: message sent to the
graph pane is a rectangle instance that establishes where the graph pain
lies relative to the top pane. The 0 @ 0 and 1 @ 1 points
indicate that the graph pane is to fill the top pane.