Example of HISA identification for the source HIGALBM329.2039+0.7101 with assigned V_LSR = −63.562 km s⁻¹. The H I profile is plotted in blue, and the identified dips are shown as red dots. The horizontal gray thick line shows the ±σ_noise and the dashed red line shows the 3σ_noise level. The black vertical dashed line and the gray shadow are the velocity of the source and the 3 km s⁻¹ tolerance.