[THIRD LIGHT]

       Here you can define the eventual contribution
       of a third star (<third light>) in the system,
       separately for each filter.

       <Third Light> is assumed to be a star that is
       <never eclipsed>, i.e. no eclipse testing is done.
       Thus, this option only affects the <contrast> of an
       eclipse, i.e. its <depth>.

       Third light is defined as L1 + L2 + L3 = 1.0,
       where L1, L2 is the contribution from the binary,
       and L3 is third light.