When the maximum dose goal for the OAR is specified, it translates into the corresponding maximum dose objective(s). What can be discerned from comparing the goal and objectives tabs, is that for a single goal, the software can create more than one objective, with different values and weights. For example, for the spinal cord planning volume at risk (PRV) clinical goal of 45 Gy maximum dose, two maximum dose objectives were created for the final optimization: 42.75 Gy (relative weight 100%) and 19.51 Gy (low relative weight of 0.125%). On the other hand, in order to implement the maximum dose goal of 28 Gy to the oral cavity, the algorithm simply applied the 28 Gy maximum dose objective to the portion of the OAR outside the PTV. However, the weight was kept low (0.2%), presumably since the objective was clearly unachievable due to the immediate proximity of the oral cavity to the primary PTV.