Intensity maps centered on HOPS 398, HOPS 399, HOPS 400, and HOPS 401 integrated over the velocity ranges shown in the upper-left corner of each subfigure. Contour levels: between 3 and 50 K km s⁻¹ at intervals of 5 K km s⁻¹ for HOPS 398 CO J = 3–2 and J = 4–3, between 5 and 70 K km s⁻¹ at intervals of 10 K km s⁻¹ for HOPS 399 CO J = 3–2, between 4 and 70 K km s⁻¹ at intervals of 10 K km s⁻¹ for HOPS 399 CO J = 4–3, between 1 and 13 K km s⁻¹ at intervals of 2 K km s⁻¹ for HOPS 400 CO J = 3–2, between 2 and 13 K km s⁻¹ at intervals of 2.5 K km s⁻¹ for HOPS 400 CO J = 4–3, between 5 and 75 K km s⁻¹ at intervals of 10 K km s⁻¹ for HOPS 401 CO J = 3–2 and J = 4–3.