VHE γ-ray excess map of HESS J1826−130 for events above 20 TeV, together with total column density map contours. The black circle and cross show the location of the pulsars PSR J1826−1256 and PSR J1826−1334. The cyan and blue contours show the total column density contours of [2.5, 9.5] × 10²² cm², derived fromNobeyama ¹²CO(1–0) and SGPS HI data, for gas velocities between 45–60 km s⁻¹ (d: 4 kpc) and 60–80 km s⁻¹ (d: 4.6 kpc), respectively. The white dashed circle and diamond are the extension and best-fit position of recently reported E > 100 TeV emitting source, eHWC J1825−134 (HAWC Collaboration 2020).