The LIMS HNO3 values are inconsistent with other LIMS measurements above about 5 mbar. During the four time periods analyzed, the LIMS HNO3 concentrations were much higher than the HNO3 concentrations computed using the other LIMS measurements (O3,H2O,NO2, and temperature). Until this inconsistency in the LIMS data is resolved, we recommend an alternative evaluation of upper-stratospheric HNO3, consistent with all other LIMS measurements, for pressure levels less than 5 mbar. The alternate method of evaluating HNO3 makes use of a photochemical equilibrium approximation to derive OH from LIMS H2O and O3; this OH is used with LIMS NO2 to derive HNO3 above 5 mbar.