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Hubble Space Telescope
Note to "dither" Package Users

If STSDAS V2.3 has been recently installed, then we recommend that users of the "dither" package should first run the task "dunlearn", just a single time, before using tasks in the "dither" package. This resets all the parameters of the dither tasks to their default values. If this is not done, then some of the tasks may crash with error messages about "parameters not found", which is due to the fact that some of the parameters of the tasks have been changed since the previous release of STSDAS.