Ground based in situ observations of wet_only_sampler at Westerland (DE0001R). These measurements are gathered as a part of the following projects CAMP, EMEP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: gamma_HCH in precip (mass_concentration_of_gamma_hexachlorocyclohexane_in_precipitation), gamma_HCH in precip_tot (mass_concentration_of_gamma_hexachlorocyclohexane_in_precipitation), gamma_HCH in precip (mass_concentration_of_gamma_hexachlorocyclohexane_in_precipitation), gamma_HCH in precip_tot (mass_concentration_of_gamma_hexachlorocyclohexane_in_precipitation)