GHRS Instrument Science Report 081 "An Analysis of Pipeline Wavelength Calibrations for the First-Order Gratings of the GHRS in Cycles 4 Through 6" Howard H. Lanning, David R. Soderblom, Anne Gonnella, and Lisa Sherbert May 22, 1997 Abstract This Report is based on the execution of the Side 2 calibration proposals 5600, 6172 and 6898, and Side 1 calibration proposals 5542, 6171, and 6897 (Cycles 4, 5, and 6, respectively). Results indicate that the default wavelength scale provided by the pipeline data reduction system has not changed significantly with time during the past three cycles.