Average profile of flare-normal-mode intervals at 327 MHz on 2003 July 21. Note the brighter, more highly polarized core component with its antisymmetric circular signature. The trailing component becomes brighter and less linearly polarized and is seen to partially overlap component IV. We note also that the deep minimum in emission between components II and III persists in the flare-normal mode. This profile is composed of 370 pulses, representing some 50 flare-normal-mode PSs of typically 5–10 pulses duration.