Left panel: 1.3 mm continuum emission observed in L1498 (Tafalla et al. 2004). Contour levels start at 2 mJy per 11′′ beam and increase by steps of 2 mJy per 11′′ beam. Middle panel: C¹⁸O (1–0) integrated intensity. Contour levels start at 0.2 K km s^-1 (6.2σ) and increase by steps of 0.2 K km s^-1. Right panel: H¹³CO⁺ (1–0) integrated intensity. Levels start at 0.1 K km s^-1 (5.9σ) and increase by steps of 0.1 K km s^-1. In each panel the spatial resolution of the map is indicated by a filled circle.