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Fig. 1.

image

Spitzer/IRAC 8 μm image of the L1157 outflow. (Podio et al. 2016). Shown as black squares are the shock events B0, B1 and B2. The class-0 protostar L1157-mm that drives the outflow is also labelled. The black line overplotted is the precession model thought to be responsible for the creation of the observed knots. As is visible here, B2 is far less intense in emission than B0/B1.

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