A reference line is a vertical or horizontal line in a graph, corresponding with user-defined values on the x-axis and y-axis respectively. Reference lines further aid the determination of angular and linear measurements.
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A dimension that exactly locates a reference point, reference line, or reference plane
An oblique line is one that is at an angle to some frame of reference.
An axis.
You can see all the points equidistant
The previous response was " 'tow the line'.... in reference to- pulling your weight, doing your share, etc." This is incorrect. The correct phrase is "Toe the line", as in "put your toes on this line next to everyone else." It may be a Navy reference. Some links: http://grammartips.homestead.com/toetheline.html http://en.wikipedia.org/wiki/Toe_the_line