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the selected (highlighted) analysis in the latter windows therefore appears as the
selected (highlighted) analysis in the “Plot” window.
(H) Fractionation / Error
The decision to reject data on the basis of “significant fractionation” as defined
above must be made within the context of the inherent error associated with the
calculation of the trace element concentrations. Select this option to view the
fractionation relative to the error.
The plot in the drawing area shows the fractionation divided by the 1 sigma error
estimate on the Y-axis and the list of elements on the X-axis. This is a more realistic
way to view the magnitude of the “fractionation”. Assuming that no significant
fractionation occurred for a run, 99% of the data will plot below 3 (3 sigma). Values
that scatter above 3 indicate possible “fractionation” or other errors, and the timeresolved signals for those elements should be investigated more carefully.
As previously indicated, all data are plotted in light grey, with the exception of the
currently selected analysis, which appears in bright green.
Ratio to standard
This option is used to plot the current analysis relative to any of the standard
reference material values currently held in GLITTER’s reference library. The list of
reference materials appear in the secondary droplist and are read directly from the
“alias.txt” and “alias_ratio.txt” files (see section 3.3) as created by the user. This
option has the advantage of checking the quality of the data on-line with the analysis
of secondary standards (e.g. BCR-1 etc.).
Select the analysis of the secondary standard in the main “GLITTER” window and
its values from the secondary droplist on the “Plot” window. Active standard
analysis are not plotted until they are toggled off and being treated as unknowns (in
the main “GLITTER” window, select the relevant standard analysis and then select
EDIT → “Toggle Standard OFF”). The y-axis is scaled dynamically to the
currently-selected analysis. Best results should scatter around 1, and GLITTER
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