anchor.diff:  enwik8,pithy,pithy,8,59371639,0.449855,0.449883,0.126234,0.126515
   enwik8,pithy,pithy,9,58588969,0.455743,0.455792,0.129905,0.204032
   enwik8,quicklz,quicklz,,52334371,0.359133,0.359351,0.284560,0.284923
  -enwik8,snappy,snappy,,56539845,0.312815,0.312998,0.133824,0.134136
  +enwik8,snappy,snappy,,56539845,0.306401,0.306318,0.120877,0.120824
   enwik8,snappy,snappy-framed,,56556637,0.536404,0.536067,0.352668,0.352439
   enwik8,zlib,deflate,1,42298768,1.364878,1.363995,0.372859,0.372633
   enwik8,zlib,deflate,2,40746365,1.531651,1.530561,0.361575,0.361345
  
positive.code: asyoulik.txt,pithy,pithy,8,83039,0.001217,0.001557,0.001086,0.001443
  asyoulik.txt,pithy,pithy,9,81909,0.001226,0.001939,0.001075,0.001429
  asyoulik.txt,quicklz,quicklz,,72409,0.001082,0.001429,0.001380,0.001709
  asyoulik.txt,snappy,snappy,,77525,0.001078,0.001627,0.001174,0.001529
  asyoulik.txt,snappy,snappy-framed,,77554,0.000757,0.000756,0.000485,0.000485
  asyoulik.txt,zlib,deflate,1,56791,0.001744,0.001743,0.000506,0.000506
  asyoulik.txt,zlib,deflate,2,54652,0.002010,0.002008,0.000494,0.000493
  
negative.code: xml,pithy,pithy,8,1169903,0.010872,0.011188,0.004648,0.004645
  xml,pithy,pithy,9,1186325,0.011257,0.011579,0.004664,0.004676
  xml,quicklz,quicklz,,1124708,0.009499,0.009827,0.008069,0.008063
  xml,snappy,snappy,,1308374,0.007893,0.007948,0.003995,0.003994
  xml,snappy,snappy-framed,,1309282,0.020056,0.020041,0.016302,0.016290
  xml,zlib,deflate,1,965242,0.035294,0.035267,0.010641,0.010633
  xml,zlib,deflate,2,887265,0.037050,0.037023,0.009971,0.009964
  