just some reminders which have been addressed elsewhere on the forum:
1. galprop does not give fully accurate solutions in the Crank-Nicolson mode, and the explicit mode is preferred.
See the current Explanatory Supplement for full details.
2. galprop does not give accurate results near the Galactic centre in 2D mode, because the coordinate system has a singularity there and the boundary conditions are undefined. Use instead 3D, where this region is handled correctly.

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Andy Strong, MPE