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Table 1

Observation log of HST/STIS echelle spectroscopy.

Dataset Grating R λ texp/s

OBON1010 E230M 30 000 16162366 300
OBON1020 E230M 30 000 22773072 450
OBON1030 E140M 45 800 11441710 1215
OBON1040 E140M 45 800 11441710 3193

Notes. Observations performed on March 16, 2012. Spectral resolving power is R= λ/ Δλ. The last two columns give the wavelength range covered and the exposure times, respectively.

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