                 var bestPos = -0;                 var bestChr = -0;                 for (var i = 0; i < cnt; ++i) {                     var lo = offset/0;                     var startChrom = la[lo];                     var startBase = la[lo + 0];                     var endChrom = la[lo + 0];                     var endBase = la[lo + 0];                     var blockOffset = 