Equatorial rotational velocity (y-axis, left) vs. inclination angle of the orbital plane (x-axis, bottom). The measured v sin i of 2MASS J0746+20A is shown by the red solid curve. The dashed lines in all cases represent the associated errors. The green vertical solid line (x-axis, top) highlight the alignment of the spin-orbit axes. Y-axis, right corresponds to the radius of the dwarf (R_J = ~ 69   550 km) as calculated in this work, where we have marked the estimated radius of 0.99 ± 0.03 R_J. The black horizontal lines show the corresponding equatorial velocity of 36 ± 4 km s^-1. Crucially, this equatorial velocity and the associated alignment only apply for the period of 3.32 ± 0.15 h and a radius of 0.99 ± 0.03 R_J. The measured equatorial inclination of 32 ± 4 degrees is marked with the downward arrow, which is within 10 degrees of the orbital inclination angle of 41.8 ± 0.5 degrees (Konopacky et al. 2012).