anchor.diff:  "NR4","621000","306800","52.61357","1.26479","Norwich","Norfolk","ENG","England"
   "NR5","618800","309700","52.64050","1.23427","Norwich","Norfolk","ENG","England"
   "NR6","622000","312100","52.66074","1.28310","Norwich","Norfolk","ENG","England"
  +"NR7","625700","311100","52.65063","1.33521","Norwich","Norfolk","ENG","England"
   "NR8","617100","313800","52.67798","1.21188","Taverham","Norfolk","ENG","England"
   "NR9","610400","308800","52.63574","1.10973","Marlingford","Norfolk","ENG","England"
   "NW1","528800","183200","51.53252","-0.14286","Camden Town","Greater London","ENG","England"
  
positive.code: "LD6","297200","269000","52.30909","-3.50804","Rhayader","Powys","WLS","Wales"
  "LD7","326100","273300","52.35240","-3.08513","Knighton","Powys","WLS","Wales"
  "LD8","328800","263800","52.26735","-3.04348","Presteigne","Powys","WLS","Wales"
  "LE1","459000","304400","52.63379","-1.12812",,"Leicester","ENG","England"
  "LE10","442900","293400","52.53641","-1.36744","Hinckley","Leicestershire","ENG","England"
  "LE11","452900","319400","52.76927","-1.21584","Loughborough","Leicestershire","ENG","England"
  "LE12","454500","319100","52.76641","-1.19217","Loughborough","Leicestershire","ENG","England"
  
negative.code: "LE16","475200","288200","52.48616","-0.89244","Dingley","Northamptonshire","ENG","England"
  "LE17","455900","285800","52.46690","-1.17706","Gilmorton","Leicestershire","ENG","England"
  "LE18","460200","298800","52.58332","-1.11141","Wigston","Leicestershire","ENG","England"
  "LE19","453600","298000","52.57718","-1.21047","Narborough","Leicestershire","ENG","England"
  "LE2","459900","301700","52.60942","-1.11531","Oadby","Leicester","ENG","England"
  "LE3","455500","303800","52.62876","-1.17993","Leicester","Leicester","ENG","England"
  "LE4","459300","307700","52.66342","-1.12309","Leicester","Leicester","ENG","England"
  "LE5","461900","304700","52.63616","-1.08521","Leicester","Leicester","ENG","England"
  "LE6","451300","307500","52.66244","-1.24141","Groby","Leicestershire","ENG","England"
  "LE65","435900","316900","52.74819","-1.46810","Ashby-de-la-Zouch","Leicestershire","ENG","England"
  "LE67","443200","313400","52.71619","-1.36041","Coalville","Leicestershire","ENG","England"
  