Premise: At the Stabian Baths (Thermae Stabianae), Pompeii's largest, you can see the separate men's and women's facilities, changing rooms, with clothes-locker niches, and three cold, lukewarm, and hot (frigidarium, tepidarium, and calidarium).

Hypothesis: The largest thermal bath in Pompeii only has 3 temperatures available.
Relation: neutral