The results of the fitting process can be checked using the widget-based routine eis_fit_viewer:
IDL> eis_fit_viewer, wd, fit
The top 3 graphic windows in the GUI show line intensity, line velocity and line width (FWHM). Note the vertical bands in the velocity window – this is due to the orbital variation of the lines on the detector (see Worksheet 7a).
With the ‘Zoom’ button depressed, the mouse can be used to draw a ‘rubber-band’ box to zoom into the images. With the ‘Pixel’ button depressed, the line profile from the selected pixel will be drawn in the bottom-left graphic window.
The bottom-right window shows a histogram of the selected images pixels for either intensity, velocity or line width.