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Editing Data
You can edit any cell by double-clicking on the cell. This dialog lets you edit the cell data:

If you change the text and click the "OK" button, the dataset will be marked as changed.
When the program ends, if the changes have not been saved, you will be asked if you want to save them:

Saving Changes
When you have made changes to a dataset, you can save them using the File menu:
- File > Save: Overwrites the original file with your changes
- File > Save As: Saves the document to a new file, preserving the original
When changes have been made to a dataset but not yet saved, an asterisk (*) will appear next to the dataset name in the tab to indicate unsaved changes.