In addition to graphs of the current strong motion data, you can add plots of extra data. For instance, if you have data of design spectra or response spectra of other strong motion data, you can compare with your data by overlaying those on your graph.
Clicking the [Read…] button opens a file open dialog box to select an extra data file. After reading extra data files, data are listed in the tree view. To edit a data label, click on the label twice like renaming on the Windows Explorer. You can control the plotting by checking or unchecking those check boxes. [Delete] button deletes extra data currently focused.
For further information, please refer to "Extra data".