Consistency with external B-mode power spectrum measurements on the full multipole range (top) and at ℓ< 350 (bottom). We compare our baseline BB^lens estimate (red points) to the SPTpol template-based results (green points; Hanson et al. 2013); and to the BB power spectrum measurements from BICEP2/Keck Array (blue boxes; BICEP2 and Keck Array Collaborations 2015a), POLARBEAR (light blue boxes; The Polarbear Collaboration 2014), and SPTpol (yellow boxes; Keisler et al. 2015), as discussed in Sect. 7.5. The black line shows the theoretical lensing B-mode power spectrum for the base ΛCDM best-fit Planck model (with r = 0).