Supplementary material for the paper MARVEL analysis of the measured high-resolution rovibronic spectra and definitive ideal-gas thermochemistry of the 16O2 molecule Four files. HybridEnergyLevels.txt contains the hybrid energy levels in the format quantum numbers, (state v J N) energy level in cm-1, error in cm-1, label: M = MARVEL or H = effective Hamiltonian MARVEL_transitions.txt contains a single file (input for MARVEL) transitions.txt giving all the transition data uses in the format transition wavenumber in cm-1 (deleted lines have negative frequency) uncertainity in cm-1, quantum numbers (upper state, lower state, see EnergyLevels) tag.linenumber PartitionFunctions.txt contains values of the partition function, its first, and second moment at 1 K increments in the format temperature in K partition function (Q) with corresponding uncertainty in parenthesis first moment (Q') with corresponding uncertainty in parenthesis second moment (Q") with corresponding uncertainty in parenthesis ThermochemicalFunctions.txt contains values of the heat capacity, the enthalpy and entropy at 1 K increments in the format temperature in K heat capacity in J / mol K (Cp) with corresponding uncertainty in parenthesis Cp / R enthalpy in J / mol (H) with corresponding uncertainty in parenthesis H / R entropy in J / mol K (S) with corresponding uncertainty in parenthesis S/ R