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Abstract The microquasar SS 433 exhibits in H alpha intermittent flares,Doppler shifted to both the red and the blue. The mean remembers the orbitalphase of the compact object. I show that the flares are not intermittentsightings of an accretion disk; rather, plasma must be expelled through the L2point, thus remembering the phase of the orbit as it invades the space beyondthe system. That space has been mapped with GRAVITY observations of a similarflare, revealing a strong rotation component.

SS 433: flares in H alpha, GRAVITY observations & L2 ejection