How to deal with SPOT sensor tilt in ATCOR-2/3?

[rese_support]

The tilt direction of the SPOT satellites is specified as "R"=right or "L"=left in the metadata. What does that mean in terms of geographic east/west?
The SPOT tilt angles are specified with respect to the direction of motion of the sub-satellite point, so "right" means geographic west for the descending orbit, where daytime data acquisition takes place, "left" means geographic east.