How Can I Create a ROOT TLegend Fill Box?

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To create a legend entry in ROOT that combines elements from different draw options, users have encountered challenges with the standard options like "L", "F", and "E". Specifically, a user is looking to replicate a legend entry that resembles a mixture of line and fill styles without the enclosing black box that comes with the "LF" option. The discussion emphasizes the need for a solution that allows for a more customized appearance in the legend, particularly when dealing with multiple graphs, such as one for error bands and another for lines. The ROOT Forum serves as a valuable resource for troubleshooting and obtaining guidance on these specific graphical issues.
ChrisVer
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Does someone know how I can make such a legend entry in ROOT?

entry.png


I have tried all the draw options ("L","F","E") but I am unable to get this result.
It really looks like a mixture of LF, but LF draws me a rectangular box enclosed in black line.

extra info: I am using two graphs, one is for the error band and the other is for the line inbetween.
 
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