Some examples of bright nebulae spectra...

The Wolf-Rayet star WR136 and is compagnon nebula NGC 6888. Note the wide H-alpha line in the Wolf-Rayet spectrum. Spectrum acquired with the slitless R3000 spectrograph and an Audine CCD camera. Red part of the spectrum is right in this representation (it is the standard representation).
Monochromatic images of NGC 6888 around H-Alpha (6563 A). Negative view.

Monochromatic images around Ha of M42 nebula (R3000 slitless spectrograph).

Same as previous image but with a different contrasted view.