arWidth);
        labelTickBottom = l % 2 * LABEL_INTERLEAVE_OFFSET;

        this.chartCtx_.save();
        this.chartCtx_.moveTo(labelTickLeft, -LABEL_PADDING);
        this.chartCtx_.lineTo(labelTickLeft, labelTickBottom);
        this.chartCtx_.stroke();
        this.chartCtx_.restore();

        this.chartCtx_.fillText(this.opsTimingData_[l].cmd_string,
            labelTickLeft, labelTickBottom);
      }

      this.chartCtx_.restore();

      this.chartCtx_.restore();
    },

    clearChartContents_(