Agilent Technologies 8453 Operator's Manual page 425

7
Calibration
Types of Calibration
To force the origin to be included in the calibration curve the calibration
points are mirrored about the origin from the first quadrant into the third
quadrant. Using all points for the regression calculation ensures that the
resulting calibration curve passes through the origin. This is also explained in
Figure 37 on page 151.
Figure 37 Forcing the origin to be included
For further information about calibration curve fits and origin treatment, see
the online help file.
Calibration Point Weighting
When setting up your default calibration curve, you can specify the relative
weighting (or importance) of the various calibration points used to generate
the curve.
The following weighting options can be selected:
Understanding Your Agilent ChemStation 151