  The total light deflection represents a concept, which allows one to decide
which multipoles need to be implemented in the light trajectory for a given
astrometric accuracy. The fundamental quantity of total light deflection is the
tangent vector of the light trajectory at future infinity. It is found that
this tangent vector is naturally given by Chebyshev polynomials. It is just
this remarkable fact, which allows to determine strict upper limits of total
light deflection for each individual multipole of solar system bodies. Special
care is taken about the gauge terms. It is found that these gauge terms vanish
at spatial infinity. The results are applied to the case of light deflection in
the gravitational fields of Jupiter and Saturn.
