Space Telescope Science Institute
FGS Data Handbook
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Fine Guidance SensorData Handbook > Chapter 5: Astrometric Error Sources > 5.5 Transfer Mode Errors

Automatic pipeline processing of Transfer Mode data is limited to locating each scan in the astrometer's data file, editing out bad data arising from garbled telemetry, and determining for each scan the median position and standard deviations of the guide stars. These activities do not introduce errors or uncertainties.
Chapter 4 presents a detailed description of Transfer Mode analysis and uncertainties inherent in the data.

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