"It's correlating the increasing intensity in different bands that provides really important clues about the structure of the source, " Prof Madejski - a co-investigator on the NuStar X-ray telescope, told BBC News.
Their energy consumption was combined with data on the CO2 intensity of the power generation mix in different countries to reveal the emissions resulting from BEV operation.
The contractions can be made to vary in intensity, and to simulate the feel of hand kneading, chopping and rubbing different parts of the body, according to the company's Web site.