I don't know the answer to the question, if there would be such a thing. What I can say, and I'll take the opportunity to answer the previous question, is that outside energy sources, external energy sources, account for between 10% and 20% of the energy produced, the energy content in the final product. So it is significant, and that's on the question the other member of the committee was asking, but it does speak to this as well.
There are experiments now on a number of different approaches, and I'll ask Dr. Kasperski, who may know these better than I, to discuss these in terms of alternatives to natural gas use in the in situ. There is--