Measurement Differences


	Isthmus


	2006


	API

	Total Barrels

	Barrels Loss

	Barrels Loss

	Mean NSV Loss

	Standard Deviation

	Number of Records


	32.70


	8,202,864


	-16,989


	-0.21

%


	-0.23

%


	0.21

	22

%


	2005


	Mean NSV Loss

	Standard Deviation

	Number of Records


	-0.11

	0.24

	32

%

%