Okay, we've gotten rid of those unsightly lines. But remember, this image only
shows light originating from doubly ionized oxygen atoms.
Let's have a look at similarly processed images taken in the light of hydrogen
atoms and sulfur ions. As you go through the images, notice the subtle
differences between them. Comparing the light coming from different types of
atoms is what allows us to turn what otherwise might be just a pretty picture
into detailed knowledge of the physical conditions from region to region within
the nebula. More on that in a minute.