Initial (i.e. after pre-main sequence eigenevolution) period distributions for binaries with different mass ratios and primary masses. Each panel corresponds to a different primary mass (as indicated in the title). The black solid line shows the overall period distribution for that primary mass, while grey lines (with different styles) indicate distributions in individual q bins. The label next to each gray line denotes the left edge of the corresponding q bin; all bins have a fixed width of 0.001. All distributions are normalized to their peak values to facilitate visual comparison across different scales. We note that the extremely short orbital period appearing here (≈10⁻⁷ days, i.e. on the order of milliseconds) is unphysical. Such systems are rarely generated and would merge almost immediately after the start of the simulation.