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origin
horizontal and vertical axes
At least three items -- the title or caption, the labels for the horizontal and vertical axes, and scales for these axes (clearly mark where the origin is). You should add legends if more than one curve exists in the graph. A text box alerting the reader what to look for will be a plus. See the related link for an example. ====================================
Usually, they are designated as the x (horizontal) axis and the y (vertical) axis.
It marks the origin - the point where the horizontal and vertical axes cross.