Fig. 2
Rotational excitation of CS by H2 and electrons in diffuse gas at moderate density, much as in Fig. 1. From top down the panels show the brightness temperature of the CS J = 1−0, J = 2−1 and J = 3−2 transitions. At left the calculation for n(H) = 256 cm-3 is shown for 15, 35 and 55 K in all panels. The observed value toward BL Lac is indicated.
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