21270719 reads; of these:
  21270719 (100.00%) were paired; of these:
    4897934 (23.03%) aligned concordantly 0 times
    15785135 (74.21%) aligned concordantly exactly 1 time
    587650 (2.76%) aligned concordantly >1 times
    ----
    4897934 pairs aligned concordantly 0 times; of these:
      180331 (3.68%) aligned discordantly 1 time
    ----
    4717603 pairs aligned 0 times concordantly or discordantly; of these:
      9435206 mates make up the pairs; of these:
        7814776 (82.83%) aligned 0 times
        1467770 (15.56%) aligned exactly 1 time
        152660 (1.62%) aligned >1 times
81.63% overall alignment rate