Table 1: Methods used to estimate the effective temperature scale for the B0.5-1.5 spectral-types.
Spec. type $T_{\rm eff}$ Method

B0.5 V 27 000 K Si III/IV ionization balance (6611-012)

B1.0 V 25 000 K Si III/IV ionization balance (3293-018; 4755-015; 6611-021 and -033)

B1.5 V 22 500 K Interpolation between B1 V and B2 V

B2.0 V 20 000 K Average of the effective temperature estimate for 11 stars based on their helium spectra

B1.0 III
21 500 K Si III/IV ionization balance (3293-003, -007 and -010)

B1.5 III 20 500 K Interpolation between B1 III and B2 III

B2.0 III 19 500 K Average of the effective temperature estimate for 2 stars based on their helium spectra

**Table 1:** Methods used to estimate the effective temperature scale for the B0.5-1.5 spectral-types.
Spec. type	$T_{\rm eff}$	Method
B0.5 V	27 000 K	Si III/IV ionization balance (6611-012)
B1.0 V	25 000 K	Si III/IV ionization balance (3293-018; 4755-015; 6611-021 and -033)
B1.5 V	22 500 K	Interpolation between B1 V and B2 V
B2.0 V	20 000 K	Average of the effective temperature estimate for 11 stars based on their helium spectra
B1.0 III	21 500 K	Si III/IV ionization balance (3293-003, -007 and -010)
B1.5 III	20 500 K	Interpolation between B1 III and B2 III
B2.0 III	19 500 K	Average of the effective temperature estimate for 2 stars based on their helium spectra

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