Top panel: azimuthally averaged surface density and angular velocity profiles of IF1 as a function of the radial distance from the center of the fragment. Bottom panel: the centrifugal radius and the enclosed mass of IF1 as a function of the radial distance from the center of the fragment. The horizontal dashed line marks the radius of the second hydrostatic core R_s.core = 5R_Jup. The vertical dashed line separates the inner and outer parts of IF1 that form a protoplanetary core and disk plus envelope, respectively, during the second collapse caused by H₂ dissociation.