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We present an atlas of three-dimensional (position-position-velocity) spectraof the Orion Nebula in optical emission lines from a variety of differentionization stages: [O I] 6300, [S II] 6716,6731, [N II] 6584, [S III] 6312, Halpha 6563, and [O III] 5007. These transitions provide point to pointinformation about the physical structure and kinematics of the nebula at aneffective resolution of 3'' x 2'' x 10 km/s, clearly showing the large scalebehavior of the ionized gas and the presence of localized phenomena such asHerbig-Haro outflows. As an example application of the atlas, we present astatistical analysis of the widths of the H alpha, [O III], and [N II] linesthat permits a determination of the mean electron temperature in the nebula of(9200 +/- 400) K. We also find, in contradiction to previous claims, that thenon-thermal line broadening is not significantly different betweenrecombination lines and collisional lines.

Velocity Structure in the Orion Nebula. II. Emission Line Atlas of Partially Ionized to Fully Ionized Gas