sSeries !== undefined) {
        tracks.push({name: 'Memory per process', series: perProcessSeries});
      } else {
        tracks.push.apply(tracks, tr.ui.tracks.buildSystemMemoryChartSeries(
            this.memoryDumps_[0].model));
      }

      for (const {name, series} of tracks) {
        const track = new tr.ui.tracks.ChartTrack(this.viewport);
        track.heading = name;
        track.height = USED_MEMORY_TRACK_HEIGHT + 'px';
        track.series = series;
        track.autoSetAllAxes({expandMax