Injection-recovery results that determine the sensitivity of the HD 17156 RV data to planetary signatures as a function of planetary mass (${M}_{p}\sin i$) and semimajor axis (a). The large black dot indicates the mass and semimajor axis of the known planet. The blue dots represent injected planetary signatures that were successfully recovered and the red dots represent those planets that were not recovered. The color scale corresponding to the probability contours of detecting a planet of a given mass and semimajor axis is shown on the right vertical axis.