[panel-id]-missed.bed is a 4-column .bed file with chromosome, missed start position, missed end position, and target ID with the track name and description as the header. This file lists the genomic coordinates for the targets that are not covered or are missed by the amplicons. It might be the entire target or only a portion of it. These regions are based on the recommended paired-end sequencing with 150 cycles.
It shows zero-based, half-open coordinates for the missed regions.
View more details about the coordinate system here.