Line profiles of CO 6–5, C³⁴S 3–2, CS 3–2, H¹³CN 2–1, H¹³ CN 1–0, HCN 1–0, and CN 1–0 at the protostellar position Ser SMM4 (left) and the associated outflow position no. 3 (right). Theblue vertical lines show the main line component and the gray lines show the hyperfine split components. The maps in Fig. 2 show the sum of all hyperfine components detected in the spectra of HCN and CN.