PRAP Graphical Display

The range of graphical display of resonance spectra and compound files can be adjusted using the mouse. In addition, the user has the option to display the data as individual data points, as data points joined by straight lines, or both.

PRAP resonance files also allow the user to change the representation of the spectrum using the Transform menu, and to display the real part of the resonance spectrum in logarithmic or linear scales. The resonance can also be displayed as a Locus Plot.

Graph Display Ranging

When displaying the graph of a PRAP resonance file or a PRAP compound file, the mouse can be used to zoom into any region of the displayed graph. Up to five zoom levels are available. The user can back out one zoom level by pressing the right mouse button while the mouse pointer is located over the graph.

To zoom in on a region of the graph;

Position the mouse pointer at a corner of the rectangular region to be displayed. The mouse pointer appears a cross hair while over the graph.
Press and hold the left mouse button.
While holding down the left mouse button, drag the mouse pointer to the opposite corner of the rectangular region to be displayed.
Release the left mouse button. The graph should then display the x and y range framed with the mouse pointer.

To undo a level of zoom;

With the mouse pointer over the graph, press the right mouse button.

Showing and Joining Data Points

The Window menu has check marked commands for enabling and disabling the display of individual data points, and the joining of those data points with straight lines. With the 'Show Points' command checked, red circles are drawn around the data points of the graph. With the 'Plot Lines' command checked, the data points of the graph are joined by straight lines.

Transform Menu

The Transform menu of the PRAP resonance file allows the user to select one of 10 representations. Different representations may yield features of a spectrum not apparent in other representations. To manually analyse a spectrum, it is usually required that the data be in a specific representation.

Logarithmic Real Graph

The real part of the PRAP resonance file graph can be displayed in a logarithmic scale by selecting the 'Plot Real as Log' command from the Window menu. This cannot be done if any point in the resonance spectrum or a fitted spectrum go negative. Logarithmic plots are useful for revealing features in the resonance spectrum away from resonance peaks.

Locus Plot

PRAP resonance files can be displayed as a Locus Plot by selecting the 'Display as Locus Plot' command from the Window menu. A Locus Plot has the real part of the resonance spectrum plotted against the imaginary part. Locus Plots are useful for studying aspects of the resonance itself.

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