H   α emission lines from Q 0151+048 A and B after subtraction of the QSOs continuum. As described in the text only the good data intervals between the strong airglow residuals were used. The data, including airglow residuals are shown as a light dotted line, the solid black line is data with the not used parts removed. The solid red lines show the best Gaussian profile fit to the used intervals. The inferred redshifts are z_{H   α(A)} = 1.9294 and z_{H   α(B)} = 1.9286.