side to our production estimates would likely entail a faster than anticipated adoption/execution of EOR techniques and infrastructure build-out in the Llanos Basin. a) In the near-term, accelerated declines from major plays represents the primary risk. Gross oil production from the Rubiales Field - the largest

chiefly driven by production from the heavy oil fields of the Llanos basin. The majority of the remaining commercial oil reserves in Colombia is in the Llanos Basin where three fields in particular (Castilla, Rubiales, and Quite) represented -40% of 2014 oil production. However, with the fields in decline, and