I usually got charts something like this
where i have e.g. for my Target line a complete series. This works like a charm.
Though sometimes i have to just compare various things with each other and only got ONE(!) X value. Therefore i also got only one value for my target line and so my series cannot draw the line between points and the result looks like this
I would need an approach for displaying a horizontal line in this case for my target line. the line should also be shown in the legend. Didnt find anything in the web.