K2 light curves folded in phase and normalised to unity for the primary (left) and the secondary (right) component of USco16m25. The circles at the bottom of the plots represent the residuals between the fit (red line) and the observed transits (black circles with error bars). The error bars were estimated from the out-of-eclipse dispersion of the K2 curve, as 0.37%. The primary eclipse curve shows a few outliers during the eclipse phases; we increased the error bars of these data points (four) by an extra factor of 4 to reduce their effect on the final determined parameters. The red line corresponds to the best-fit model to the global set of data (light curves, photometric transits, and radial velocities).