Table 2: Measurement of the EW of strong absorption lines (without obvious variability and presumably photospheric) in the spectrum of BD $+53\hbox {$^\circ $ }$ 2790.
Line EW (Å)

He II $\lambda$ 4200 Å 0.4

H $\gamma$ 2.2

He I $\lambda$ 4471 Å 1.3

He II $\lambda$ 4541 Å 0.4

He I $\lambda$ 4713 Å 0.5

He I $\lambda$ 4923 Å 0.7

**Table 2:** Measurement of the EW of strong absorption lines (without obvious variability and presumably photospheric) in the spectrum of BD $+53\hbox {$^\circ $ }$ 2790.
Line	EW (Å)
He II $\lambda$ 4200 Å	0.4
H $\gamma$	2.2
He I $\lambda$ 4471 Å	1.3
He II $\lambda$ 4541 Å	0.4
He I $\lambda$ 4713 Å	0.5
He I $\lambda$ 4923 Å	0.7

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