Bio-Rad Model 680 Microplate Reader Accessories - Manual (Page 82)

Microplate Manager User Guide
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Figure 54. External Standards dialog box.
If you are already using external standards, the External Standards checkbox will be
selected. To stop using external standards, deselect the checkbox and click on OK.
To begin using external standards, click on the External Standards checkbox. This
will activate the File button. Click on the File button and a dialog box will open.
Figure 55. Selecting the source file for the external standards.