Same convention as Fig. 1 but for MDC684. The blue contour levels are (−3, 3, 6, 9, 12) × σ, with σ = 0.88 Jy beam⁻¹ km s⁻¹, and the red contour levels are (−3, 3, 6, 9, 12) × σ, with σ = 0.78 Jy beam⁻¹ km s⁻¹. (a) The cyan crosses represent water maser spots obtained from the JVLA program 17A-107 (PI: Keping Qiu) and the green cross shows the position of the protostar candidate identified in Kryukova et al. (2014). The black arrow line indicates the PV cut path.