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• Low-mass objects have much more collimated flows than high mass sources.
• Wolf-Rayet stars are also argued9 to give rise to gamma-ray bursts, a related but rare class of explosions characterized by highly-collimated relativistic jets.
• Although the most collimated outflows look very much jet-like at the highest velocities, their behavior is much more classical at lower speeds.
• Closing the aperture results in more collimated light, as only light traveling in the right direction can make it through the smaller opening.