Sensitivity curves of 10-year MPTA (blue) and 30-year SKA (orange) computed from HASASIA. The vertical dashed lines correspond to the frequency associated with the observing time span of MPTA and SKA (highlighted with vertical dashed lines). For completeness, the square mean of sGWB produced by our MBHB populations at different e₀ models are represented in different colors. Pale (dark) blue and orange lines correspond to the MPTA and SKA sensitivity curves when accounting for pulsar white noise only (white plus red noise).