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The screen header indicates the scale of the graph. For example, SCALE 1:10 means that each character position in the graph represents 10. The scale is adjusted automatically so that the largest displayed value ends near the right margin and zero is near the left margin of the graphic display.
The scale can be modified online by entering the desired scale in the header line. One reason for doing this is to eliminate the effect of one or more erroneous values that distort the graph. For example, if all generations of a variable have values between 1 and 500 except a single generation whose value is 10 million, setting the scale to 1:10 produces a meaningful display of all generations except the one whose value is 10 million.
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