Central 50′′ field comprising the MHO 2235 NE part. N up, E left. Left: epoch 4 image overlaid with knot identification and slit position for K-band spectroscopy. Right: Ep4 image with proper motion vectors, amplified by a factor 20 for clarity. The color coding of the pm vectors is as follows: PM₁₄ (blue), PM₁₂ (red), PM₁₃ (green), PM₂₄ (cyan), PM₂₃ (yellow), PM₃₄ (magenta). Protostars are shown with red circles. Ser-emb-11 E and W (a binary Class I) and Ser-emb-17 are strong candidate driving sources. Magenta circles denote YSO candidates from Harvey et al. (2006). The maser refers to an H₂O maser position from Brand et al. (1994).