The main features of this main window are indicated in Figure 2 . Click on a menu item to pop up the associated menu. Select a menu item by positioning the pointer on it and releasing the mouse button. Below the menu bar is the button bar consisting of action buttons which provide a faster means of invoking functions also available from the menus. At the left of the workspace is the mode palette which permits changing operating mode of vuespec.
Different actions result from mouse clicks and motion within the plot windows.
The full plot window at the top always shows all of the spectra currently open. The middle, main plot window shows all or part of the spectra, the model components, and resulting fit spectrum. In zoom and pan mode, the view on the data may be changed by dragging out a zoom box in the main window, dragging the scroll bars, or moving or resizing the zoom marker in the summary plot window. At the bottom of the workspace is the auxiliary plot window used to display residuals of the fit. At the bottom of the workspace are three text windows containing informative messages.