Fig. 3
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Comparison of the normalised impulse response (solid lines) at 1.1 ms integration period between TTP used by GRAVITY standalone, and the main VLTI DL used by GRA4MAT. The weighted average of the impulse response (vertical dashed lines) show an additional latency of ~500 µs. The responses were measured in 2023 after the fringe tracker real-time controller upgrade.
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