 perSecond = True)
   *   }
   */
  function createEmptyHistogram_(interval, histograms) {
    if (interval.perSecond) {
      return {
        perSecond: true,
        energy: histograms.createHistogram(`${interval.name}:power`,
            tr.b.Unit.byName.powerInWatts_smallerIsBetter, [], {
              description:
                `Energy consumption rate for ${interval.description}`,
              summaryOptions: {
                avg: true,
                count: false,
                max: true,
   