Past changes in the vertical distribution of ozone - Part 1: Measurement techniques, uncertainties and availability by Hassler, B, Petropavlovskikh, I, Staehelin, J, August, T, Bhartia, P, Clerbaux, C, Degenstein, D, De Maziere, M, Dinelli, B, Dudhia, A, Dufour, G, Frith, S, Froidevaux, L, Godin-Beekmann, S, Granville, J, Harris, N, Hoppel, K, Hubert, D, Kasai, Y, Kurylo, M, Kyroelae, E, Lambert, J, Levelt, P, McElroy, C, McPeters, R