+ var errorMinus = parseFloat(item[2]);
+ var errorPlus = parseFloat(item[3]);
+
+ var yv_minus = yv - errorMinus;
+ var yv_plus = yv + errorPlus;
+ this.points[i].y_top = DygraphLayout._calcYNormal(axis, yv_minus);
+ this.points[i].y_bottom = DygraphLayout._calcYNormal(axis, yv_plus);