19498454 reads; of these:
  19498454 (100.00%) were unpaired; of these:
    8332488 (42.73%) aligned 0 times
    8324543 (42.69%) aligned exactly 1 time
    2841423 (14.57%) aligned >1 times
57.27% overall alignment rate
19498454 reads; of these:
  19498454 (100.00%) were unpaired; of these:
    8332488 (42.73%) aligned 0 times
    8324543 (42.69%) aligned exactly 1 time
    2841423 (14.57%) aligned >1 times
57.27% overall alignment rate
[bam_sort_core] merging from 9 files...