Structure confidence $ρα$ as a function of number of angles $Ma$ (left) and noise level σ (right). High and low structure confidence are illustrated with qualitative examples of $xxC,xxS$⁠, and $xx†$⁠. Both plots show that as the data quality (i.e. number of angles and signal-to-noise ratio) increases, the structure confidence increases too, and we are more certain of the presence of the structure.