Phase-resolved spectral parameters of 4U 0115+63 obtained using the model const*tbabs*bbodyrad. Instrumental cross-calibration constants were fixed at their average values. Unabsorbed X-ray fluxes were calculated in the 0.5−10 keV energy range. The blackbody radius (R_BB) is derived from the normalization of the bbodyrad component, assuming isotropic emission and a source distance of 5.0 kpc. The dotted gray lines in each panel indicate the average pulse profiles from Obs1, Obs2, and Obs2016 in arbitrary units.