20415019 reads; of these:
  20415019 (100.00%) were paired; of these:
    4382245 (21.47%) aligned concordantly 0 times
    15434926 (75.61%) aligned concordantly exactly 1 time
    597848 (2.93%) aligned concordantly >1 times
    ----
    4382245 pairs aligned concordantly 0 times; of these:
      179860 (4.10%) aligned discordantly 1 time
    ----
    4202385 pairs aligned 0 times concordantly or discordantly; of these:
      8404770 mates make up the pairs; of these:
        6365844 (75.74%) aligned 0 times
        1891191 (22.50%) aligned exactly 1 time
        147735 (1.76%) aligned >1 times
84.41% overall alignment rate