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What do outlined reads in IGV represent?

I've been looking at some of my NGS data in IGV, and I've found some reads that aren't given a block colour, but instead are outlined in blue. I can't seem to find an answer in the IGV docs, does anyone know what this colour scheme signifies?

I've attached a link to a picture by way of example

igv alignment next-gen

1 answer

A black outline indicates that the selected read has no mate. Source here

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