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The ctool::get_roi() replaces some duplicated code in ctselect and ctcubemask. The method extracts the RoI from the user parameters "ra", "dec" and "rad". In case the "usepnt" parameter is present and set to "yes", the "ra" and "dec" parameters will not be read, and it's up to the client to set the RoI centre properly.
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…no selection was performed)
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The processing for empty event files is skipped. The file is simply written out empty again.
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…(see #1360 for details).
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…)-function of individual ctools
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…ts the intervals, leading in the worst case to an empty event list if no overlap exists.
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…d scave() methods to ctool interface. Add read_ahead() method to handle reading of task parameters at the beginning of the task execution. Remove all m_read_ahead members from the derived classes.