Lower bounds on m_WDM (top) and m_FDM (bottom) for R = 100. The pessimistic case is represented by the blue squares, while the optimistic case is denoted by the red diamonds. Filled markers correspond to the reference sensitivity; empty markers indicate a sensitivity increased by a factor of $\sqrt{10}$ (i.e. a white-noise PS decreased by a factor of ten). Shown for reference are the dashed green and dotted orange lines, marking the lower bounds inferred by Iršič et al. (2024) and Iršič et al. (2017a), respectively.