I think that is a way of showing that a section of the time line with no related events has been removed from that place on the line. A more common way of showing that is with a pair of slashes spanning a break in the line (------//------).
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It means, that the numbers of the data about to be put on starts somewhere usually higher than 0 so the jagged line represents the number not needed or used.
The line of a graph is quite often used to indicate the average of various data points that fall both above and below the line. Very jagged lines get smoothed out, but the trend is the same.
Ah, honey, it's called a "tic mark." Like a little tick-tock on the scale, guiding you through the ups and downs of your graph. Just remember, it's not about the name, it's about the data it represents. So keep on graphing, darling, and don't let those tic marks trip you up.
it depends on what the graph is. if it is a distance vs time graph, the line will be a line with the slope being the speed/total time if it is a speed vs. time graph, the line will be horizontal at y=the speed if it is an acceleration vs time graph, the line will be horizontal at y=0
It is called a time plot.