Line profiles of SiO in the L1157-B1 shock. The line intensity in main-beam temperature (Tmb) from 29SiO (red), and 30SiO (blue) is over-plotted on the main isotopologue, 28SiO (grey), by multiplying for their solar isotopic ratios ([28Si/29Si]⊙ = 19.7, [28Si/30Si]⊙ = 29.8, Anders & Grevesse 1989). The transitions are labelled. The baseline and the systemic velocity (+2.6 km s−1, Bachiller et al. 2001) are indicated by the horizontal and vertical dotted lines, respectively. The vertical dashed lines indicate the three velocity intervals where the integrated intensity has been calculated: [−23, −13], [−13, −3], and [−3, +5] km s−1, see Table 1. The red-shifted component that appears to be associated with 29SiO 2− 1 is due to blending with the 13CH3OH 41,3 –3−2,2 line.
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