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Table C.1.

Keck I/LRIS observation log of GLEAM-X J0704–37. The blue (red) side was binned at 2x2 (2x1) (spatial vs spectral axis). The 600/4000 grism was used on the blue side, and 400/8500 grating on the red side, leading to a resolution of approximately 1.2 and 1.1Å, respectively. Total time includes read-out between consecutive exposures.

Date Exposures Total Time (h) Conditions Airmass
Night 1: 08 Nov 2024 5×900 s 1.3 Light cirrus; 1.1" seeing 1.8–2.0
Night 2: 30 Nov 2024 11×900 s 3.0 Moderate cirrus; 0.9" seeing 1.8–2.5

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