I'm using the featureCounts function of Rsubread to assign aligned reads to features. Something like ~20% of my reads are unassigned (in the "NoFeature") category. Is there any way to see which reads these are? (Maybe it's possible in command-line subread, outside of R?) I'd like to be able to look at my unassigned reads to understand if they're contamination or from an un-annotated part of the genome or what.