Close relationship between the X-ray corona and radio jet behavior. (a) The X-ray coronal height from time-lag fits (rainbow colors corresponding to those in Figure 1, joined with the black dashed line), the radio flux density from AMI (red) and the Swift/BAT count rate in 15–50 keV (blue), as functions of MJD time. The coronal height refers to the left black axis, the radio flux density and the Swift/Burst Alert Telescope (BAT) light curve refer to the right axis in red and blue. (b) In the hard state, the X-ray corona contracts while the steady compact jet is weakened in the radio. (c) In the hard-to-soft state transition, the X-ray corona expands, and there launched a ballistic transient jet (superposed on the quenching steady jet) several days lagging behind the X-ray change.