Expected multiplicity ratio ﹩\left\langle {f}_{\gt 1}^{\mathrm{USP}}/{f}_{1}^{\mathrm{USP}}\right\rangle ﹩, for different inclination dispersions (i_rms) drawn from a Fischer distribution assuming that all USP planets have one companion in the period range indicated. The periods of the outer companion are drawn from the distribution in Equation (3), which gives an average period. The different bands represent the 1 − σ range of the different constraints on this ratio. The black band (orange) is the sample from this work with a cut in mass of ﹩{M}_{s}\gt 0.75\,{M}_{\odot }﹩ (no mass cut). The green band corresponds to the measurement from Sanchis-Ojeda et al. (2014).