FTIR spectra in the spectral range 3850–2900 cm^-1 of (a) a coronene:water:argon matrix codeposited at 10 K; (b) a water:argon matrix of concentration ~1:500 deposited at 10 K and divided by a factor of ten; and (c) a water:argon matrix of concentration ~1:50 deposited at 10 K and divided by a factor of twenty. The attributions of water and coronene for spectrum (a) are presented in Table 1.