Thanks, Luisa. During the third quarter of 2017, the Cartagena refinery completed one of the most important milestones related to its operation and stabilization, all the individual unit performance test. In the last quarter, we're going to initiate the global refinery performance test, which is the final step in the refinery stabilization process. During 2017, the Cartagena Refinery has started to increase its margin reaching, during the third quarter, a result of $10.3 per barrel average, representing a 34% increase compared to the previous quarter. The throughput also has grown, reaching an average of 136,000 barrels per day in this quarter versus an average of 120,000 barrels per day in the same period of 2016. The Barrancabermeja refinery continues performing as a profitable and efficient refinery. The refinery margin during the third quarter reached $14.60 per barrel, compared to $13.40 per barrel during the same period of 2016. This increase was based on operational stability of the refinery and the good performance of international margins between fuels and crude oil. It is important to note that during 2017, the throughput and utilization factor of the Barrancabermeja refinery have been impacted by lower availability of light crudes in the processed crude slate. Now I turn the presentation over to María Fernanda Suárez who will comment on the financial results for the period.
Maria Suárez: Thank you, Thomas. Ecopetrol continues to demonstrate the benefits of being an integrated company. Diversification is reflected in its continuous financial strength. Year-to-date, our revenues have increased 16% versus the same period in 2016. Year-to-date, the export crude basket was strengthened by 36%, equivalent to $12 per barrel, going from $33.60 per barrel in 2016 to $45.60 per barrel in 2017. This increase is explained by 2 reasons. First, an increase of around $9.30 per barrel in the Brent side; and secondly and even more significant, a better differential over our basket of crudes improving $2.70 per barrel in this period. The sales team's ability to respond to an end customer and take advantage of market opportunities has had a positive effect on the prices of our crude basket versus Brent. The export basket improved its spread, and international refining prices has had a positive impact on the Asian and Russian segments, as have higher efficiencies of refineries in the production of diesel and gasoline. For its part, the midstream continued to leverage the result of the group despite posting a slight decline in revenue compared to 2016 primarily due to the lower crude national volumes transported by oil pricing. Let's now move on to the next slide to examine the business group's EBITDA performance. The business group increased its EBITDA by 28% over 2016, earning COP 17.3 trillion in 2017 this far. Our financial and operational strength allowed us to achieve a stable EBITDA margin of 43% year-to-date. These results have positioned Ecopetrol as having one of the highest EBITDA margins among oil and gas company peers. The highest contribution to EBITDA in 2017 comes from the upstream segment. This result is leveraged on $3 per barrel decline in the pricing spread of our crude export basket compared to the same period in 2016 as well as higher crude price. In turn, costs were up as a result of the increasing maintenance and workover activities in several fields, supporting our production target for the year with a lower decline rate over our basic production curve. The EBITDA of the downstream segment remained stable compared to the previous year despite higher cost of raw materials, largely seen by the recovery of hydrocarbon prices. I will also highlight the Cartagena Refinery's contribution to our EBITDA generation of around COP 60 billion due to its production of diesel and gasoline to supply the domestic market. The midstream segment remains critical to the business group's positive financial performance. It represents 35% of the company's EBITDA with a margin of 77%. Now let's go to the next slide to examine the evolution of net profit. Year-to-date net profit as of September 2017 dulled the results of 2016. We achieved the highest operating and net margins of the past 3 years, an indication of our operating efficiency. Cost of sales, excluding depreciation, was up COP 1.8 trillion, largely due to better international oil prices, higher volumes of crude purchases and the increasing maintenance and workover activities. Operating expenses were down some COP 0.4 trillion due to a lower world tax and the resulting income of the sales of minor fields in 2016. Depreciation was up COP 0.8 trillion, largely due to the start of operations of Ecopetrol America's Gunflint field in August 2016 and the incorporation of fewer reserve by the end of 2016. It is worth noting that this year's third quarter saw the incorporation of the total monthly reserves from offshore fields in the depreciation rate, reflecting a better ratio between the investment level and the useful life of assets. The exchange rate spread had a negative change of COP 1 trillion. The exchange rate year-to-date is up around 2% and has resulted in an expense due to the exchange rate spread given the business group net asset position. It is important to note that during the same period last year, the business group posted a gain on the exchange rate spread given the 8.6% appreciation and its net asset position in dollars, both with no impact on the company's cash. The change in the net dollar position from one period to the other was the result of the implementation of net investment hedge in June 2016. Net financial income improved COP 0.5 trillion, largely due to a lower interest expense. The business group debt level fell 15% versus 2016, strengthening its capital structure. The effective tax rate was 53%, with higher tax spending as a result of improved financial result. It is important to note that both operating expenses and the provision for income were impacted by our extraordinary COP 160 billion items as a result of the reconciliation of the adjustable expenses, with the Colombian national taxes and customs authority on the Hocol income tax return. Net profit attributable to Ecopetrol shareholders for 2017 was COP 3.2 trillion, more than double for all of 2016. In the next slide, we will have a look at the group's cash flow. Ecopetrol closed the third quarter with a solid liquidity position of COP 12.8 trillion, including cash and cash equivalents and short and long-term financial investments. Operating cash flow for the quarter was COP 4.7 trillion, a result of the group's efficient operating management and the recovery of hydrocarbon prices. Capital investment during the quarter reached COP 1.4 trillion, driven by the resumption of activity in our main fields, the shift in growth investments for 2018 will not impact the production goal of 715,000 barrels of oil equivalent per day. Ecopetrol will deliver on its target as a result of a lower decline rate on the fields, explained by efficiency and operational excellence through maintenance activities. It is also worth highlighting the efficiency reached in 2017 in terms of production and development cost for this segment. Cash flow from financing activities totaled COP 0.7 trillion, 93% for sponsor interest payments and 7% for amortizations. October ended with the sale of the remaining shares of Empresa de Energía de Bogotá, closing now the financial divestment cycle which totaled COP 1.8 trillion between 2015 and 2017. The group's financial strength is reflected in the significant improvement of its debt metrics with gross debt to EBITDA at 2.1x at the close of the third quarter versus 3.1x at the third quarter of 2016. This strength allows Ecopetrol to progress along the path of organic growth and capturing organic growth opportunities. I will now hand the floor over to our CEO for final conclusion.