The input file will be uncompressed automatically. Observed lamp spectra can be re-scaled using the slider bar to the left of the upper plot window. These buttons expand the spectrum. The FLIP X button reverses the X-axis. The REV APS button reverses the aperture numbering scheme.
Wavelengths are in vacuum.
The FWHM of the atlas emission features can be altered by the next text widget. This may be useful when calibrating first-order low resolution data where the weakest emission features are not present in the observed spectrum. A small tick mark should appear above the emission feature in the upper plot. The reason for this requirement is so that the system will be able to determine whether the order numbers increase or decrease with increasing aperture number. The scroll bar at the right allows the user to view the different fitting functions available.