Resulting for coplanar dynamical fits as a function of inclination separately for Lick (blue) and OAO data (green), and for the combined data sets (red). The test starts at i = 90° and goes down to i = 3° with a step size of − 1°. Black lines are the 1 D χ² curves interpolated from the individual fits and applied to individual data sets. The dashed lines represent 1σ, 2σ, and 3σ levels obtained from Δχ² confidence values of 1.0, 4.0, and 9.0 larger than the χ² minimum achieved for each data set. For the Lick data, the minimum at i = 7° is statistically significant at the 2σ level, indicating that an inclined solution is slightly preferred, while the OAO data has its minimum at i = 90°, showing that near edge-on configurations are preferred. For the combined data the minimum is around i = 16°, but is within1σ from the coplanar edge-on fit.