Peak temperature (in mK) of the J = 5∕2 − 3∕2 Π⁻ and Π⁺ manifolds (left and right columns resp.) toward L1521E, L1521B, L1498, and L1544 (from top to bottom) as obtained from Gaussian fits to the spectra. In each panel, the x-axis gives the position offsets (in ′′). Open symbols show the observations with 1σ error bars while the dashed lines and filled squares locate the theoretical peak intensity if optically thin lines and Boltzmann equilibrium assumptions hold.