2083498 reads; of these:
  2083498 (100.00%) were paired; of these:
    2019882 (96.95%) aligned concordantly 0 times
    53567 (2.57%) aligned concordantly exactly 1 time
    10049 (0.48%) aligned concordantly >1 times
    ----
    2019882 pairs aligned concordantly 0 times; of these:
      264 (0.01%) aligned discordantly 1 time
    ----
    2019618 pairs aligned 0 times concordantly or discordantly; of these:
      4039236 mates make up the pairs; of these:
        4028996 (99.75%) aligned 0 times
        8176 (0.20%) aligned exactly 1 time
        2064 (0.05%) aligned >1 times
3.31% overall alignment rate
[bam_sort_core] merging from 1 files and 1 in-memory blocks...