Examples of the integrated observed spectra around the blue WR bump for three selected regions: R1 in NGC 1056 (left), R1 in IC 225 (middle), and R1 in NGC 3773 (right). The blue vertical line shows the location of the He iiλ4686 line. The significance level (ε_orig) is given on the top left corner. The red solid line shows a linear fit to the continuum. The green sections of the spectrum correspond to those spectral ranges used to compute the rms. The fitted continuum spectrum with STARLIGHT is overplotted in orange. Bottom: the corresponding continuum-subtracted spectra derived for each of the three selected regions. The value of ϵ is provided in each case. The flux is given in units of 10^-16 erg s^-1 cm^-2 Å^-1.