Energy levels, transition frequencies and Einstein A coefficients for the fine structure line spectrum of the ³P ground state of O⁺⁺ and its ¹D first excited state are taken from the NIST database.

Collision rates with atomic H are from Yan & Babb (2023) and cover temperatures in the range from 10 to 10,000 K.

Collision rates with electrons are from Tayal & Zatsarinny (2017) and cover temperatures in the range from 100 to 80,000 K.