Shoulder modes

If shoulder detection is enabled, the following models are available to calculate suitable peak areas:

• Drop baseline

• Tangent baseline

• New exponential

• Gaussian

Drop baseline

A drop line from the inflection point separates the shoulder peak from the main peak.

Figure Shoulder with drop line

Tangent baseline

A straight line through the inflection points define the shoulder peak.

Figure Shoulder with tangent baseline

New exponential

This shoulder mode draws a curve using an exponential equation. It approximates the leading or trailing edge of the shoulder peak.

Figure Shoulder with new exponential baseline

Gaussian

This shoulder mode model uses the same equation as the New Exponential mode; however, it searches higher up on the parent peak to find the best fit. Gaussian skim usually calculates a larger area than the New Exponential skim.

Use Gaussian mode, for example, if you need to guarantee the absence of byproducts.

Figure Shoulder with gaussian baseline