The computation of the ra/dec J2000 for the fits headers was modified on 16sep04. ... The difference between the ra/dec in the header and the ra/dec computed from the encoders i s shown in the plot below. ... This is the Rafits-RaEnc for the 900 seconds of a drift scan. ... The step size in ra [asec/sec] for the fitRa values (black) and the encRa values (red). The ra values from the header are jumping around by about 2 arc seconds relative to the 15 Asec/sec of the sidereal drift. ...