[cairo] Emphasized coordinates

[necko necko]

I use the library for displaying connection between a number of coordinates.
Since this number might be very large, the line thickness is small. However, these
coordinates are very important, and I wonder whether there is a way to somehow
make them more clear. This would mean that the join of two lines should be a dot
a bit more emphasized (slightly larger than the line thickness). Is there a way to achieve
this in cairo?
Many thanks
 		 	   		  
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