Comparison of the upper 95% confidence limits of the tensor-to-scalar ratio posteriors for (1) CMB only; (2) CMB and thermal dust; (3) CMB and synchrotron; and (4) CMB, synchrotron, and thermal dust (in addition to noise), all evaluated for the baseline experiment configuration. Each point represents the mean of the 95% confidence limits evaluated from 20 simulations, and the error bar indicates the 68% region among the same simulations. The horizontal gray dashed line indicates the value for Case 4, representing the full model, SN10. The true input value is r = 0.