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The vertical line is known as the y axis. It is nothing more than a measuring stick to count how far up or down a point is from the horizontal line. The horizontal line, then, is known as the x axis and measures the distance left or right from the vertical line.
y-axis direction, specified as one of these values: 1  xy â Default direction. For axes in a 2-D view, the y-axis is vertical with values increasing from bottom to top. 2  ij â Reverse direction. For axes in a 2-D view, the y-axis is vertical with values increasing from top to bottom.