94 Understanding Your Agilent ChemStation
4 Integration
Baseline Allocation
Tangent Skimming
Tangent skimming is a form of baseline constructed for peaks found on the
upslope or downslope of a peak. When tangent skimming is enabled, four
models are available to calculate suitable peak areas:
• exponential curve fitting,
• new exponential skim
• straight line skim,
• combined exponential and straight line calculations for the best fit
(standard skims).
Exponential Curve Fitting
This skim model draws a curve using an exponential equation through the
start and end of the child peak (the height of the start of the child peak is
corrected for the parent peak slope). The curve passes under each child peak
that follows the parent peak; the area under the skim curve is subtracted from
the child peaks and added to the parent peak (see Figure 17 on page 95).
Figure 16 Exponential skim
New Mode Exponential Curve Fitting
This skim model draws a curve using an exponential equation to approximate
the leading or trailing edge of the parent peak. The curve passes under one or
more peaks that follow the parent peak (child peaks). The area under the skim
curve is subtracted from the child peaks and added to the main peak. More
than one child peak can be skimmed using the same exponential model; all
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