{
  "fields": [{"id":"_id","type":"int"},{"id":"Tiempo de llegada","type":"text"},{"id":"año","type":"numeric"},{"id":"valor","type":"numeric"}],
  "records": [
    [1,"5 min o -",2013,37.1],
    [2,"6 a 10 min",2013,30.1],
    [3,"11 a 15 m",2013,17.7],
    [4,"16 min o +",2013,15.1]
]}