Plotting nice graphs is not easy.
http://www.dougrice.plus.com/dev/graphs/GPHDEMO.PAS is a demo using TurboPascal 3.0
http://www.dougrice.plus.com/dev/UART/UART2_Plotter.htm part emulates a Tandy plotter.
Turbo Pascal offered a screen size of 640x200 and in Hi Res mode you could plot in black and white.
The "black" could be one of the dos colours
The "White" was green
When you look at technical papers that are printed black and white, if they had graphs, they had a border and ticks.
Possibly they had a base line for each axis
The ticks should be plotted starting from the base line towards the edges.
If the graph has a graticule, it needs to be grey, not black.
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