Panel a: Hα image from the SHS toward the G345.5+1.5 region. The black contours represent the 8 μm emission (100, 300, 500 mJy sr⁻¹), and the white contours represent the integrated Hα emission (from 35 to 530 R km s⁻¹ with 55 R km s⁻¹ steps) from the WHAM-SS. Panel b: spatially integrated Hα emission where the star-points represent the data and the red curve represents the Gaussian fit to the data.