* data format where series[i] = [x,y,{extras}].
* @param {!number} rollPeriod The number of points over which to average the data
* @param {!DygraphOptions} options The dygraph options.
* data format where series[i] = [x,y,{extras}].
* @param {!number} rollPeriod The number of points over which to average the data
* @param {!DygraphOptions} options The dygraph options.