(a) Spatial distribution of the low-energy cosmic-ray ionization rate (LECRIR); (b) median LECRIR values within five visual-extinction ranges ([5–10], [10–15], [15–20], [20–50], and [50–300] mag) across the five subregions of the Orion molecular complex. The representative A_V values for these ranges are 7.5, 12.5, 17.5, 35, and 175 mag, respectively. Small offsets have been applied to the A_V values of each subregion for clarity. Also shown are the Voyager-based ﹩{ \mathcal L }﹩ model (solid black line) and the reproduced diffuse-region ﹩{ \mathcal H }﹩ model (dashed black line; M. Padovani et al. 2018a, 2024), along with previous LECRIR measurements (gray dots) derived from ion tracers such as H﹩{}_{3}^{+}﹩, OH⁺, and HCO⁺ (S. Gabici 2022; N. Indriolo 2023). (c) Relationship between LECRIR and star formation rate for four subregions. The LECRIR for each subregion is estimated using the median value derived from areas with A_V ≥ 15 mag. The linear fit between LECRIR and star formation rate is shown with a black solid line. The gamma-ray emissivities per hydrogen from the Fermi survey for the two groups (Regions 1 and 2 and Regions 3 and 4) are shown as violin plots for comparison, with their scale on the right-hand axis.