A. Phase Dispersion Minimization (PDM) plots for all epochs of 2M J0746+20A, after subtraction of the putative ∼2.14 hours rotational period of the secondary component, showing theta statistic against frequency days⁻¹. The deepest minimum of the quantity theta marks the most likely rotational period of ∼3.32 hours. B. The same PDM theta plot, zoomed into the area around the deepest minimum theta statistic that corresponds to the primary’s period of rotation established in this work, consistent with the rotation period resulting from LS periodogram analysis.