Grey area in the spectra graph
I wonder what is the grey area around the line in the SDSS's spectral graph ?
Here is the link to the image: https://drive.google.com/open?id=0B5eVaYKwc5gJeEtEbXJmUnhFNlk
all spectra have scatter but a z=0.112 will have more
by Budgieye moderator
The grey lines are an indication of the artifacts in the Earth's atmosphere, interfering with the spectrum. It gets worse at 9000, where the water in the air absorbs much of the far red light. As noted in the post above, you notice it more in dim objects.
Would it make more sense in the old format, where it forms a baseline?