Question: What was the total surface area of the supercontinent where Tritheledontids have lived ?

<P0-S0> The Swiss Vapeur Parc is a miniature park in Le Bouveret, a village on Lac Léman, Switzerland. <P0-S1>  It was opened on June 6, 1989, by an International Festival of Steam (therefore steam trains). <P0-S2>  When the park opened its total surface area was 9000 m² (2.2 acres), but the park expanded and as of 2007, the park covers a surface area of 17'000 m² (or 4.2 acres). <P0-S3>  In 1989, the park possessed only 2 locomotives (one running on benzine and one on steam). <P0-S4>  As of 2007, the number of trains running on benzine has sextupled while the number of steam trains has increased to 9 trains. <P0-S5>  By March 31, 2007, the Park has had 2'126'000 visitors. <SEP> <P1-S0> The Tritheledontidae or tritheledontids, also known as ictidosaurs, were small to medium-sized (about 10 or 20 cm long) cynodonts. <P1-S1>  They were extremely mammal-like, highly specialized cynodonts, although they still retained a very few reptilian anatomical traits. <P1-S2>  Tritheledontids became extinct in the Jurassic period, possibly due to competition with prehistoric mammals such as the triconodonts. <P1-S3>  Tritheledontids were mainly carnivorous or insectivorous, though some species may have developed omnivorous traits. <P1-S4>  Their skeletons show that they had a close relationship to mammals. Tritheledontids or their closest relatives may have given rise to primitive mammals. <P1-S5>  The tritheledontids were one of the longest lived non-mammalian therapsid lineages, living from late Triassic to the Jurassic period. <P1-S6>  They are known from finds in South America and South Africa, indicating that they may have lived only on the supercontinent of Gondwana. <P1-S7>  The family Tritheledontidae was named by South African paleontologist Robert Broom in 1912. <P1-S8>  The family is often misspelled "Trithelodontidae". <SEP> <P2-S0> Gondwana ( ), or Gondwanaland, was a supercontinent that formed from the unification of several cratons in the Late Neoproterozoic, merged with Laurussia in the Carboniferous to form Pangaea, and began to fragment in the Mesozoic. <P2-S1>  It was the largest continental landmass on Earth, covering an area of 1000000 km2 or 64% of today's continents. <P2-S2>  Located in the Southern Hemisphere, it incorporated several modern landmasses, including Antarctica, South America, Africa, Madagascar, and Australia, as well as the Arabian Peninsula and the Indian subcontinent, which have now moved entirely into the Northern Hemisphere. <SEP> <P3-S0> Brunauer–Emmett–Teller (BET) theory aims to explain the physical adsorption of gas molecules on a solid surface and serves as the basis for an important analysis technique for the measurement of the specific surface area of materials. <P3-S1>  In 1938, Stephen Brunauer, Paul Hugh Emmett, and Edward Teller published the first article about the BET theory in the Journal of the American Chemical Society. <P3-S2>  The BET theory applies to systems of multilayer adsorption and usually utilizes probing gases that do not chemically react with material surfaces as adsorbates to quantify specific surface area. <P3-S3>  Nitrogen is the most commonly employed gaseous adsorbate used for surface probing by BET methods. <P3-S4>  For this reason, standard BET analysis is most often conducted at the boiling temperature of N (77 K). <P3-S5>  Further probing adsorbates are also utilized, albeit with lower frequency, allowing the measurement of surface area at different temperatures and measurement scales. <P3-S6>  These have included argon, carbon dioxide, and water. <P3-S7>  Specific surface area is a scale-dependent property, with no single true value of specific surface area definable, and thus quantities of specific surface area determined through BET theory may depend on the adsorbate molecule utilized and its adsorption cross section.