STECF POA/FOS-002 FOS Wavecal data analysis (I) Florian Kerber, Anastasia Alexov, Paul Bristow & Michael R. Rosa Abstract FOS/BLUE observations of the dM1e star AU Mic have been used to look for systematic offsets between the wavelength scales obtained from an external source and the internal calibration lamp. Contrary to earlier findings we do not see any systematic offsets when using data from the POA corrected archive. We conclude that the previously reported offsets had been introduced by the deficienceis of the original calibration.