# What's the differences between one-dimensional spectrum and two-dimensional spectrum?

mostly, we use the one-dimensional spectrum. But sometimes we use two-dimensional spectrum, what's the differences between them?

• check out the one at Keck that I use, the documentation might prove more helpful than any else. www2.keck.hawaii.edu/inst/hires Dec 6 '16 at 7:11
• No problem thumbsup Dec 7 '16 at 15:16