Schematic showing the cylindrical grid (in green). Left panel: grid as seen from the observer. The pink dots are examples of (ρ, θ)-rays (to follow the Python convention used by the code, the indices given start at 0). The native GCM grid at the terminator of an example simulation is shown in black to illustrate its non-uniform vertical spacing. Right panel: the side where we can follow light rays (dashed lines) as they go horizontally from left to right. The red boxes illustrate how the x-discretisation is computedfor each ray to follow closely where it goes from one cell of the spherical grid to another.
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