Editing Infrared spectroscopy (section)

===Regions===
A spectrograph is often interpreted as having two regions.<ref name=OChemSmith3E>{{cite book | last1 = Smith | first1 = Janice Gorzynski | editor1-last = Hodge | editor1-first = Tami | editor2-last = Nemmers | editor2-first = Donna | editor3-last = Klein | editor3-first = Jayne | name-list-style = vanc | title = Organic chemistry | date = 2011 | publisher = McGraw-Hill | location = New York, NY | isbn = 978-0-07-337562-5 | pages = 463–488 | edition = 3rd | chapter-url = http://highered.mheducation.com/sites/007340277x/student_view0/index.html | chapter-format = Book | chapter = Chapter 13 Mass Spectrometry and Infrared Spectroscopy | access-date = 2018-06-30 | archive-date = 2018-06-28 | archive-url = https://web.archive.org/web/20180628152511/http://highered.mheducation.com/sites/007340277x/student_view0/index.html | url-status = dead }}</ref>
* '''functional group region''' <math>\geq 1,500 \text{ cm}^{-1}</math>
In the functional region there are one to a few troughs per functional group.<ref name=OChemSmith3E />
* '''fingerprint region''' <math> < 1,500 \text{ cm}^{-1}</math>
In the fingerprint region there are many troughs which form an intricate pattern which can be used like a fingerprint to determine the compound.<ref name=OChemSmith3E />