Fig. 11
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Plot of our model in the 1816 Å Si II line in the case where electronic collisions are disabled. The fit is poor, particularly for LVC #2 and for the disc, because far from β Pic, UV pumping is inefficient at populating the excited Si II level at 287 cm−1. Collisions must be taken into account in the model to properly fit the data (see the bottom panel of Fig. 8).
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