Location:

Detection tab page
Report Variable (Detection Parameters)

Type:

Selection

Dimension:

-

Value Range:

Tangential at lower peak end, Tangential at both peak ends or Exponential

Default:

Tangential at lower peak end

Related Parameters:

Rider Threshold

Maximum Rider Ratio

Type (Peak Type)

Description:

This parameter indicates how Rider Peaks are skimmed.

Function:

There are three options:

• Tangential at lower peak end (default and the common skimming method): For ascending rider peaks, the peak start, and for descending rider peaks, the peak end is defined in such a way that rider skimming is tangential to the chromatogram.

• Tangential at both peak ends: Peak start and peak end are determined so that rider skimming is tangential at both chromatogram ends.

• Exponential: The chromatogram is approximated by an exponential function, so that the slope of the chromatogram and the exponential function correspond at the peak start and the peak end of the rider peak. This option clearly distinguishes from the two others. In most cases, Exponential maps the actual course of the curve very accurate. With this option, the rider peak will usually receive a more realistic larger area. You can use this option only if a sufficient number of data points is available.

 Tip:

You can move the baseline in the chromatogram with the mouse for tangentially skimmed riders, but you cannot for exponentially skimmed riders.

 Note:

When reprocessing a chromatogram, the skimming function can be set manually for each rider peak. The required commands are available on the context menu of the selected peak.