Number of lines in the spectra recorded when the U–Ne HCL was operated at 6, 9, and 12 mA using the VIS setup (from 500 to 1000 nm). The subset of confirmed U lines (with a corresponding line in the literature) is shown in blue. The subset of confirmed Ne lines is shown in red. We show the number of U line candidates in orange (line candidates with line width comparable to the FWHM of the confirmed U lines and with no match in the literature).