your numbers are correct, Shona was a spectacular business.
It´s important to see that the last quarter was positive and have recovered quite the production (8000) in February, plus yesterday's news that are about 3000 barrels of gas, this new production puts it very close to the previous one but the earnings for the first quarter of 2013 should be much higher with better netbacks, and with very positive expectations for the new fields discovered.
GLTA