Observed counts vs. model with PSF at the Vela source, E > 400 MeV, spinning mode. The error bars are Poisson errors around the sum of the counts within 10° × 0.25° slices in galactic longitude (top) and galactic latitude (bottom). The data are compared to a model (solid curve) composed of an isotropic component (dash-dot), a galactic diffuse component (dash), and a point source (dash-dot-dot-dot) with reduced in longitude and 1.96 in latitude with 38 degrees of freedom. The composite PSF has a spectral index α =  −1.66, weighted by effective area, spectrum, and EDP. Smoothing the model with a Gaussian (red dotted) yields σ = 0.27 and reduced with 37 degrees of freedom in longitude and σ = 0.21 and reduced in latitude, yielding likelihood ratios and 4.9 respectively.