Solved
The error is in the metafile Mathcad creates, so it is what it is. It's been like this for years, and it's unlikely to ever get fixed. I use one of two approaches to get around it. One is to paste the graphic into a drawing program such as Adobe Illustrator, and clean it up there. So in your example I would paste with solid lines, and then change the lines to dashed in Illustrator. The other approach is to create a table of the data, copy and paste that into Excel, and create the graph there. If I need a top quality graphic then I may even create the graph in Excel, and then edit it in Illustrator.
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