L1287 NH₃ beam-averaged column density, corrected for primary beam response, derived from NH₃ (1, 1) and (2, 2), assuming a beam filling factor f = 1 (color scale).The color scale ranges from 2 × 10¹⁴ cm⁻² (blue) to 2 × 10¹⁵ cm⁻² (red). The contours are the NH₃ (1, 1) integrated line intensity, corrected for opacity, Aτ_mΔV, of the Guitar core (top, velocity range − 20.16 to − 18.31 km s⁻¹), RNO 1 and blue filament (middle, − 18.31 to − 17.07 km s⁻¹), and red filament (bottom, − 17.07 to − 14.60 km s⁻¹). Contours are from 1 to 37 in steps of 4K km s⁻¹. The crosses correspond to the YSOs identified in Fig. 3.