Example of the gap-finding procedure for the sight line toward quasar ATLAS J029.9915−36.5658. The Lyα (bottom) and Lyβ (top) spectra are depicted along with identified gaps (colored bands). Contamination from metal systems is also displayed (vertical blue lines) and corresponding gaps have been removed (gray-strip bands). In this example, a high-ionization metal system potentially affecting the Lyα forest is identified, leading to the removal of three joint gaps.