Production rates ratio of HO to HO as a function of time. The dots refer to total production rates based on maps. Squares refer only to the ratio of production rates in the jet, which have smaller error bars (data from Tables A.3 and A.4). Triangles refer to nadir measurements of the production rate per unit solid angle, including uncertainties due to the HO baseline when specified (larger symbols). The Earth (VSMOW) value and the value derived from the ROSINA experiment (Altwegg et al. 2015) are shown for comparison.