[[File:Im1Dpane.png|thumbnail]]
The plot of the 1D spectrum is probably the most important/useful of all. It shows the extracted, sky-subtracted (if applicable) spectrum obtained using the settings given in the Spatial Profile pane, and is updated in real-time as settings are changed.
If the spectrum is labelled as an '''arc''' in the header, the QL tool will attempt to perform automated wavelength calibration. This is generally robust and no changes of settings should be needed. For the less frequently used gratings or for unusual grating angles, the default parameters may not work so well, and so notes for advanced users to change settings to the fitting routine are provided ZZZ
After wavelength calibration of an arc, a '''library reference spectrum''' will be overplotted in green allowing the user to quickly check the quality of the calibration. As mentioned in the introduction, this is intended to be a quick look calibration at the ~2A level and solutions should be refined if greater precision is needed to meet the science requirements. As a further aid, the wavelength of the midpoint of the spectrum is printed to the bottom of the screen, allowing the observer to monitor any possible drifts in the wavelength coverage.
Should the user, for some reason, not want to use the wavelength calibration, or just view the data in pixel units, the '''"ignore WLC"''' button may be used. In this case, the output extracted spectrum written will also only contain the pixel solution. To retrieve the solution, reload the arc by pressing "Update" next to the Current Frame box.
For a '''science spectrum''', the plot will show both the extracted objected and the subtracted background (which is the sky + bias). The '''wavelength calibration''' of the preceding arc will be used, under the assumption that the observer will always be taking an arc prior to a science exposure. If this is incorrect and the wrong WLC becomes attached, use "ignore WLC".
In addition, buttons for '''smoothing''' the spectra are provided, as well as an option to '''print''' the 1D view. This will produce a PDF file in /tmp/tmp.pdf and send it to the printer in the warm room.
=== GUI log ===