Research A varying quasar spectrum by Jesse Rogerson|Published 30 January 2014|1 comment I’ve been working on reducing, plotting, and normalizing Gemini spectra over the last little while. Here’s a final product. Here’s an example of the type of spectra I’m working on. In chronological time, the spectra are ordered black, red, blue. This indicates the absorption feature associated with CIV got deeper from black to red, but has stayed roughly the same since.