Large-scale filaments and spurs. Top panel: longitude-velocity view of filaments and spiral arms as well as spurs. Belts with various colors are arms in Taylor & Cordes (1993) model or spurs from Reid et al. (2019) with widths of 10 km s⁻¹. Red, brown, blue, and green represent the Norma-Outer, Scutum-Centaurus, Sagittarius-Carina, and Perseus arms, respectively. The orange belt marks the Local spur and the purple belt is the Scutum spur. Black circles denote our SEDIGISM filaments. Black plus symbols, squares, triangles, and diamonds represent ATLASGAL filaments (Ge & Wang 2022), BGPS filaments (Wang et al. 2016), previously known filaments (Zucker et al. 2018), and outer Galaxy large-scale filaments (OGLSF, Colombo et al. 2021), respectively. Orange marks denote filaments associated with the Local spur. We zoom in on the region around the two spurs. Bottom panel: Face-on view of filaments and spiral arms as well as spurs. The cyan and pink dashed curves represent the Local arm and 3 kpc arm from Reid et al. (2019). Since the zoom-in region is in the solar neighborhood, as a reference, we plot arms from Hou (2021) model as dotted curves. Other symbols follow the convention of the top panel.