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Table 4.

Tests of LETG/ACIS data at λ ∼ 20 Å.

Sample λ EW
Å
W07±a 20.03 ± 0.01 8.2 ± 2.3
W07+b 20.03 ± 0.01 6.5 ± 2.7
W07−c 20.02 ± 0.01 13.4 ± 5.0
3669d 20.01g 6.9 ± 3.2
Finale 20.02 ± 0.01 6.0 ± 1.9
Final and 3669f 20.02 ± 0.01 6.2 ± 1.7

Notes.

(a)

Observations used in Williams et al. (2007), positive and negative first orders co-added.

(b)

Observations used in Williams et al. (2007), but only positive first order.

(c)

Observations used in Williams et al. (2007), but only negative first order.

(d)

Large pointing offset observation 3669.

(e)

Using all the public data in Oct 2017 obtained with Δy = +1.5 arcmin and SIM − Z = −8 mm.

(f)

Combining the results of the final sample and of the observation 3669.

(g)

After correcting the wavelength scale as indicated by the shift of the wavelength of the Galactic O I line.

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