- - What the line y = 0 overlays
- - Graph basis
- - Part of graph along which x-coordinate is plotted
- - Bar graph element
- - Line on which y = 0
- - Horizontal line on a graph
- - Math teacher's line
- - Graph reference line
- - Horizontal reference line on a graph
- - Y = 0 line
- - Graph of y = 0
- - Place for Cartesian coordinates
- - Horizontal line
- - The line y = 0
- - It's horizontal in a Cartesian coordinate system
- - The line y = 0, in math
- - Cartesian graph line
- - Horizontal line in a mathematical plane
- - Abscissa line
- - Reference line, in math
- - Base line?
- - Graph line
- - Horizontal graph line
- - Plot line
- - Graph component
- - Graph part
- - Bottom line
- - Part of chart area covered in twenty-one seconds
- - People plot things around it
- - Representer of time, often
- - It often represents time
- - Horizontal base of a coordinate system
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