Discontinuous Galerkin finite element method for the continuum radiative transfer problem inside axis-symmetric circumstellar envelopes

Open Access

Fig. C.1

Example of a ray (red line) normal to the image plane, crossing the spherical grid. In this example, we display a square image of size L × L and a circular image of radius R. The red crosses represent the intersections between the ray and the grid. The values of $κ_{v}^{ext}$ $\[\kappa_{v}^{\text {ext }}\]$ and S_v at these intersections are linearly interpolated from the grid adjacent values (red dots).

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