Notes. For the free-knot splines technique, η corresponds to the initial knot spacing of the intrinsic spline, ·_ml to the initial knot spacing of the extrinsic microlensing splines and η_ml pos. to constraints on the position of such knots. “-” for η_ml indicates that the microlensing splines have a single knot, regardless of their length. For the regression difference technique the parameters ν (smoothness degree), A (amplitude in magnitudes), scale (length scale in days) and errscale (observation variance in days) refer to the Matérn covariance function used in the Gaussian process regression implementation of the pymc.gp module (see Tewes et al. 2013a; Patil 2010). In the rightmost column (brown symbol, marked with an *), the Matérn covariance function is replaced by apower-law covariance function and ν indicates the power-law index used.