Global Nonlinear Least-Squares Equilibrium Analysis:

Part 4: Scan Editing Previous: Scan Diagnostics Next: Parameter Controls

Even though editing of equilibrium data is accomplished elsewhere, you can still redefine the limits of the data range used for the fitting for each scan in the global equilibrium control window. While the first editing procedure allows you to set rough limits for the equilibrium scans, define the meniscus and other parameters, the editing part in the global equilibrium control window only allows you to define new limits for a given scan. For example, you may want to crop a stray point at the end or the beginning of the scan, or delete a dip in the absorbance near the meniscus, or delete excessive noise at the bottom of the cell.

In order to edit the actual data, select the desired scan with the scan selector from the model control window, or by clicking on the scan in the scan list of available equilibrium scans. Next, find the region that you would like to exclude from the scan and drag the mouse through the plot area until the region to be deleted is highlighted in red. Release the mousebutton. The region of the scan that is highlighted in red will be deleted and the scan will be redrawn and rescaled. You can repeat this procedure multiple times. First, delete any points at the bottom of the cell, then any points near the meniscus. Once you cross the center of the scan, the highlighted region will flip to the side into which you are moving with the mouse.

As soon as the limits of the scan have been redefined by this method, the Reset Scan Limits button will be activated. Should you make an error, you can reset the the scan limits by clicking on this button. The button will only be activated if the scan limits for the active scan in the plot window have been modified.

Previous: Scan Diagnostics Scan Editing Next: Parameter Controls

www contact: Borries Demeler

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Last modified on January 12, 2003.