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We require the BAM file be sorted, that's it.

Often, pipelines that write bam files also write the bam index (BAI) file alongside it. Great!

If the BAI file is available, we will use it and you can immediately view the reads below the 10kb zoom window while we compute coverage data above that threshold.

If no BAI file is preset, we compute both the BAI and the coverage data in one pass.

Unfortunately, until that compute is finished, it's not possible to read any data in genomic coordinates and thus you won't be able to see any reads at any zoom level.