I'm looking for a way to access the data used to produce these plots for instance. These plots show the spectrum of various Wolf-Rayet stars. I found a few websites where you have some informations on those stars here for instance, but I'm not able to find and download a file containing the spectrum data of the stars.
If you know how to reduce raw spectrum data, you may look at the official archives of big observatories (ESO, MAST, CADC). But a quicker and much easier way could be to use the following portal:
Typing the name of some Wolf Rayet stars will lead you to reduced data and thus spectra.