16. Extrapolation
The Extrapolation button opens a window that is similar to the extrap program (Mueller, 2013), except the extrapolation window has been redesigned with buttons instead of menus. QRev defaults to the extrapolation settings determined automatically from the extrap algorithms. The user can use the Extrapolation window to switch to or explore other extrapolation settings, apply manually selected extrapolation settings, and evaluate the sensitivity of the discharge to the extrapolation settings. The user can explore different extrapolation settings without applying them to the measurement if “Cancel” is selected to close the window.

![]() The Previous Extrapolation Settings are the extrapolation settings that will be used when exiting with Cancel.
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![]() Allows user to zoom, pan, and query the graphs. For more information see Toolbar.
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![]() Allows the user to add a comment. For more information see Comment Button.
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![]() Cancels any changes so the extrapolation remains as displayed in Previous Extrapolation Setting. Closes the window and returns control to the main window.
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![]() Applys the extrapolation settings from the Fit Panel to the data. Closes the window and returns control to the main window.
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