Relative efficiency between the HPM and LPM scenarios (solid curves) and between the HDM and LDM scenarios (dashed curves) in implanting planetesimals in the inner disc. The orange colour identifies the high-mass disc when comparing the efficiencies of the HPM and LPM scenarios, and the high-mass planets when comparing the efficiencies of the HDM and LDM scenarios. The blue curves identify the LDM and LPM scenarios, respectively. High relative efficiencies in the curves can still be associated with limited absolute efficiencies (given in Table 2). Increasing the disc mass enhances the implantation efficiency in the part of the inner disc closer to the giant planets, while increasing the planetary masses enhances the implantation efficiency closer to the host star.