Changes

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".