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: precipitation_amount in precip (lwe_thickness_of_precipitation_amount), aluminium in precip (mass_concentration_of_aluminium_in_precipitation), arsenic in precip (mass_concentration_of_arsenic_in_precipitation), cadmium in precip (mass_concentration_of_cadmium_in_precipitation), lead in precip (mass_concentration_of_lead_in_precipitation), nickel in precip (mass_concentration_of_nickel_in_precipitation), zinc in precip (mass_concentration_of_zinc_in_precipitation)