There are two different ways to simulate an aspect solution instead of reconstructing it from the measured data. The simulation software is incorporated in the aspect solution object and can be controlled by the control parameters ASPECT_SIM and SASZERO. Setting ASPECT_SIM=1 produces an aspect solution with a simulated pointing behavior which is qualitatively similar to reality. The roll angle is calculated according to the control parameter AS_SPIN_PERIOD. Setting SASZERO=1 (preceding over ASPECT_SIM=1) produces an aspect solution assuming a perfect pointing to Sun center and calculating the roll angle according the control parameters AS_ROLL_SOLUTION and AS_SPIN_PERIOD.