It depends a lot on the facility that you're putting it in, but generally speaking, globally, the heavy differentials reflect that processing cost. So if you think of a Maya to Brent differential, seven or eight dollars a barrel reflects two things. It reflects the processing cost. It also reflects the yield that you get out of a refinery, so you get a lower value mix of products out and you put more energy in to process it in a more complex refinery, so all of those things together—
On March 10th, 2015. See this statement in context.