Dygraph.prototype.doZoomY_ = function(lowY, highY) {
// Find the highest and lowest values in pixel range.
var r = this.toDataCoords(null, lowY);
Dygraph.prototype.doZoomY_ = function(lowY, highY) {
// Find the highest and lowest values in pixel range.
var r = this.toDataCoords(null, lowY);