Vernier Spectro Pro - Manual (Page 45)

Spectro Pro Reference
Spectro Pro 8
Examine is a toggled mode (a checkmark appears next to the menu item
when it is on). When active, the mouse pointer becomes a vertical line
and the value of the data at the indicated time is displayed in the graph
legend.
Tangent is a toggled mode (a checkmark appears next to the menu item
when it is on). Tangent enables the drawing of a short tangent line at the
cursor location to each data column plotted. The numerical value is
displayed in a floating box. The number of points used to calculate the
slope can be set in under Preferences in the File menu.
Make Annotation allows you to create a floating box with any text you
choose. This is useful for placing comments on graphs. To edit an
annotation, double click on the floating box. To remove an annotation,
click the close box on the upper right corner of the floating box.
The interpolate function can only be used after a function has been fit to
experimental data using the Automatic Curve Fit…, Manual Curve
Fit…, or Linear Fit function described below. After choosing interpolate,
the value of the fitted function is displayed as a function of cursor
position.
Linear fit performs a linear least-squares fit on the selected data. If there
is no selection made the entire data run is used.
The Automatic Curve Fit item gives you a choice of advanced curve-
fitting options. These curve fits are automatic in the sense that the fit
parameters are determined by Spectro Pro using the least-squares
methods. The dialog box below is opened.
Analyze menu
Examine
Tangent
Make Annotation
Interpolate
Linear Fit
Automatic Curve Fit