Spectrum with extremely high-velocity (EHV) emission in the GSS 30 map as indicated by arrows, originating from the Class 0 source VLA 1623. Any outflow emission from GSS 30 itself can not be disentangled from VLA 1623 in the present observations. From top to bottom: one high-velocity position (−45″, 0″), one wing position (−30″, −225) and one off-source position (375, 225). The baselines are marked by dashed lines. The high-velocity bullet at 28 km s^-1 has not been identified in earlier studies of VLA 1623.