**Table 2:** Ions and the number of their excitation states considered for the calculation of HD 37776 model atmospheres.
Ion	Levels	Ion	Levels	Ion	Levels	Ion	Levels
H I	9	N I	21	Ne I	15	Si II	40
H II	1	N II	26	Ne II	15	Si III	30
He I	24	N III	32	Ne III	14	Si IV	23
He II	20	N IV	1	Ne IV	1	Si V	1
He III	1	O I	12	Mg I	13	S II	14
C I	26	O II	13	Mg II	14	S III	10
C II	14	O III	29	Mg III	14	S IV	15
C III	12	O IV	1	Mg IV	1	S V	1
C IV	1

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