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rgsangles (rgsangles-4.9.2) [xmmsas_20211130_0941-20.0.0]

...../rgslib/index.html).[*]
Please note that the calling interface to the described functions and subroutines of the OAL and of the CAL is not accurate, but is specified as pseudo-code for illustrative purposes only. The documentation of the OAL and CAL has to be consulted to find the actual calling sequence.
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....[*]
This of course evaluates $=0$. However the implementation in rgslib is such that gratingAspectAngles calculates these angles with respect to an imaginary central grating of the RGA, and hence $\phi_0$ and $\psi_0$ are the angles of incidence on this grating corresponding to an on-axis source.
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