Zoomed-in view of the spectral decomposition using Gaussian fitting of the Hα line in the averaged one-dimensional observed optical spectrum of the central arcsecond of Mrk 231. Six components were required to get the best fit marked by the solid red line. Dashed blue, black, red, magenta, yellow, and cyan lines show the individual Gaussian components. The aperture size for spectral extraction is 1 arcsec. The wavelength axis (abscissa) depicts the observed wavelength.