J. Notholt and M. Palm (U. Bremen)– Bruker 120HR operated from 2000-2003, Bruker 125HR since 2004. Data archived since 2002. Maximum resolution 0.0028 cm 1. Typically make one or two observations per week. Retrieval with SFIT2, SFIT4, and GFIT. The flat surroundings are conductive to satellite validation. The FTIR observations are complemented by DOAS measurements.