conscious effort to address the discrepancy, but continued varying usage across canon, reference, and licensed sources have not fully resolved the discrepancy. Most of Andor's cities are built underground to take advantage of geothermal warmth. Temperatures have been known to reach −28 °C in the summer. Andor has at least one moon or neighboring planet. Andorians share their homeworld with an obscure telepathic subspecies, Aenar, which have either light blue or white skin. The non-canonical Star Trek Star Charts (2002) cites Andor as the seventh planet in orbit around the star Procyon (Alpha Canis Minoris) in the Beta quadrant, but previous material has Andor as the eighth planet of the orange dwarf Epsilon Indi in the Alpha quadrant. Andor is near Betazed, Earth, Tellar, and Vulcan. Noncanonical information A 1970s technical fiction book, The Starfleet Medical Reference Manual, held that Andorians were the only known semi-insectoid race in Federation territory, with a limited exoskeleton and antennae used for both quadriscopic vision reception and focused hearing. These points were repeated in the 1980s book Worlds of the Federation. Fully insectoid races depicted or referred to onscreen include the unseen Jarada in the Next Generation episode "The Big Goodbye", and the Xindi, which were introduced in Star Trek: Enterprises third season. In the Deep Space Nine relaunch novels, four-person Andorian marriages (briefly mentioned in the Next Generation episode "Data's Day") were extrapolated into four sexes (thaan, chen, shen, and zhen). A recurring plot point in the post-TV series novels is that the rarity of compatible Andorian foursomes produced extremely low reproduction rates which, in tandem with genetic weaknesses, led to the species' near extinction. Similarly, the Marvel comic book Star Trek: Starfleet Academy refers to complex yet flexible marital structures, involving one or more fathers, and describes Andorians as passionate, with a violent history. In the Pocket Books continuity, specifically the 2010 novel, Star Trek: Typhon Pact – Paths of Disharmony by Dayton Ward, the Andorian Empire withdraws from the Federation in 2382. However, the Andorian government still maintains diplomatic relations with the Federation, and Andorian officers are allowed to remain in Starfleet if they so choose. Despite Andor's withdrawal, a sizable percentage of the population – represented in the Andorian government by the "New Progressive Party", as opposed to the secessionist "Visionist Party" – favored continuing membership in the Federation, opening the possibility of a later reunification. In a subsequent novel,