Equatorial rotational velocity vs. inclination angle of the orbital plane for 2M J1314+13B. The green solid curve plots the v sin i of 2M J1314+13B (45 ± 5 km s⁻¹) (McLean et al. 2011). The black horizontal lines show the inferred equatorial velocity of 58.2 ± 0.2 km s⁻¹ for 2M J1314+13B. The dashed green and black lines correspond to the error in this measurement. We find that our photometric period of rotation, combined with the latest estimated radius of 1.808 ± 0.018 R_J (Dupuy et al. 2016), results in an equatorial inclination angle of 50.6${}_{-7.5}^{+9}$ degrees, consistent with an inclination of the stellar rotation axes with with respect to the plane of the sky of 49.34${}_{-0.23}^{+0.28}$ degrees (Dupuy et al. 2016).