How i can do graphics with high sharpness using ggplot ??

I am making its graph,

but the lines seen a little distorcionateds.
The same graph was maked in Stata and the lines are perfects. But I need change my work to R studio.

I want make a graph with this calidad of lines, all lines is beautiful. For example, the lines of the graphs of this link all are smooth.

Do I have a problem on my r-studio or graphics card?

How are you exporting the graph? If you export with higher dpi or to a vectorial format you wouldn't have this issue.

If you need more specific help, please provide a proper REPRoducible EXample (reprex) illustrating your issue.

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