Fig. 1
a) Graphical explanation of the BCD (D,λ1,φb,φuv) parameters in the spectrum of the B9.5V star HR4468; b) determination of the BCD parameters of the emission line star IPHAS J002926.93+630450.2, with B9Ve spectral type. ΦBalmer lines is the line connecting the bottom of the higher Balmer lines, and δD is the difference between the values of D obtained from ΦBalmer lines and Φuv.
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