The initial parabola is calculated as before and the optimization is run for the full domain rather than the
midpoint. The new minimum of the curve is then found and the curve is reflected about that point to represent the
final etendue conservation curve for that angle. For larger angles, this method could not be used as the maximum of
the curve is reached around the midpoint of the domain and therefore when the optimization is run for the entire
domain the curve furthest from the incoming sun will be driven to a height equivalent to that of the receiver. This
large increase in height is due to the central section blocking the farther parabola from the sun completely. Using
etendue conservation for larger incident angles becomes unpractical and therefore only tracking is used beyond 40϶.
The resulting off-peak curves for a sun angle of 20° and 40° are given in Figure 4a) and b), respectively