It is most useful for tracing wavelength calibration lamp spectra that do not have a continuum that can be traced by normal means. When the widget appears, select the input image file format. The filename of the image will be displayed on the title bar of the image display window. Locating the spectral orders is a manual process, giving the user total control. The extracted spectrum will be displayed in the same window used for the trace fit residuals.
Spectral extraction is done by simple direct addition.
The is the same as the input filename without the extension. For echelle spectra, it will be necessary to reform the array because the spectra are stacked in the table, forming a large one-dimensional array. This box displays current status of the user requests. Useful for extracting multiple images taken with the same optical parameters. QUIT - make sure you save your work before quitting.