First complete and reliable IR line list for 16O32S18O. 0.01–0.02 cm−1 accuracy when compare to measured ν1 and ν3 bands. More reliable IR analysis in a 0.25 cm−1 window of 628/828/626 mixed sample. New semi-empirical refinement including SO2 646, better converged calculations. Agreement with HITRAN and CDMS is consistent with we had on 626 and 646.