Solar wind parameters observed by STEREO A during 16:00−16:40 UT on 2011 July 16. From top to bottom: pitch angle distribution of suprathermal electron (246.6 eV), magnetic field components in LMN coordinates, proton velocity, velocity components in LMN coordinates, magnetic field strength, azimuthal and elevation angles of field direction in RTN coordinates, proton density, and proton temperature. Vertical magenta dashed lines bracket a reconnection exhaust. Vertical black dashed line marks the boundary between SIR1_STA and SIR2_STA at 16:28 UT.