Abstract
We present an atlas of three-dimensional (position-position-velocity) spectra of the Orion Nebula in optical emission lines from a variety of different ionization stages: [O I] 6300 Å, [S II] 6716,6731 Å, [N II] 6584 Å, [S III] 6312 Å, Hα 6563 Å, and [O III] 5007 Å. These transitions provide point to point information about the physical structure and kinematics of the nebula at an effective resolution of 3 arcsec×2 arcsec×10 km s^{-1}, clearly showing the large scale behavior of the ionized gas and the presence of localized phenomena such as Herbig-Haro outflows. As an example application of the atlas, we present a statistical analysis of the widths of the Hα, [O III], and [N II] lines that permits a determination of the mean electron temperature in the nebula of (9200+/-400) K. We also find, in contradiction to previous claims, that the non-thermal line broadening is not significantly different between recombination lines and collisional lines.
