Created attachment 62986 [details]
In line charts its not possible to use more than one format for each data series. I often need to use separate formatting e.g., when one data series consist of both true values (line) as well as a prognosis for the future (dotted).
I can use separate data series for the two but then the legend doesn't show the series as one but as two entries.
In excel its possible to individually format each slot individually.