anchor.diff:  ptt5,pithy,pithy,8,87776,0.001541,0.001880,0.002133,0.002707
   ptt5,pithy,pithy,9,83599,0.001549,0.001899,0.002144,0.002483
   ptt5,quicklz,quicklz,,86471,0.001527,0.001874,0.002204,0.002541
  -ptt5,snappy,snappy,,92963,0.001420,0.001933,0.002342,0.002675
  +ptt5,snappy,snappy,,92963,0.000464,0.000465,0.000339,0.000339
   ptt5,snappy,snappy-framed,,93058,0.001750,0.001749,0.001598,0.001597
   ptt5,zlib,deflate,1,65553,0.003250,0.003247,0.000981,0.000981
   ptt5,zlib,deflate,2,63891,0.003520,0.003518,0.000959,0.000958
  
positive.code: grammar.lsp,pithy,pithy,8,1859,0.000726,0.000920,0.001029,0.001271
  grammar.lsp,pithy,pithy,9,1839,0.000730,0.000924,0.001024,0.001246
  grammar.lsp,quicklz,quicklz,,1775,0.000722,0.000914,0.001022,0.001249
  grammar.lsp,snappy,snappy,,1800,0.000722,0.000915,0.001013,0.001233
  grammar.lsp,snappy,snappy-framed,,1818,0.000020,0.000021,0.000017,0.000017
  grammar.lsp,zlib,deflate,1,1326,0.000070,0.000070,0.000016,0.000016
  grammar.lsp,zlib,deflate,2,1306,0.000072,0.000072,0.000016,0.000016
  
negative.code: samba,pithy,pithy,8,7726020,0.054796,0.055110,0.019244,0.019230
  samba,pithy,pithy,9,7650312,0.055175,0.055491,0.019307,0.019293
  samba,quicklz,quicklz,,7309452,0.047266,0.047586,0.041128,0.041251
  samba,snappy,snappy,,8008774,0.036981,0.036952,0.018156,0.018148
  samba,snappy,snappy-framed,,8012410,0.087193,0.087125,0.067045,0.066993
  samba,zlib,deflate,1,6329449,0.205882,0.205722,0.055403,0.055360
  samba,zlib,deflate,2,6128866,0.220583,0.220409,0.053873,0.053831
  