Baselines are developed in a number of ways.
We do actually have monitoring data from the region that goes back a number of decades in some cases, particularly from Wood Buffalo National Park. It is a national park in a federal jurisdiction, so we do have some information from decades past that we've published on the oil sands portal.
We also have a range of data from other sources and monitoring programs that were done in years past. What we've tried to do is to collect this data and try to analyze it for equivalency so that we can establish what the baselines looked like, at least in the early days of the development of the oil sands resource.