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The current number-one for the week ending April 24 , 2006 is " S.O.S. (Rescue Me) " by Rihanna . CHART CRITERIA There are twenty-five positions on this chart. They are ranked by the number of detections (calculated by summarizing a song's number of spins and the audience size of the radio station playing it). Songs receiving the greatest growth will receive a "bullet", although there are tracks that will also get bullets if the loss in detections doesn't exceed the percentage of downtime from a monitored station. "Airpower" awards are issued to songs that appear on the top 20 of both the airplay and audience chart, while the "greatest gainer" award is given to song with the largest increase in detections. A song with six or more spins in its first week is awarded an "airplay add". If a song is tied for the most spins in the same week, the one with the biggest increase that previous week will rank higher, but if both songs show the same amount of spins regardless of detection the song that is being played at more stations is ranked higher. Songs that fall below the top 15 or have been on the chart after 26 weeks are removed and go to recurrent status. HOT DANCE AIRPLAY PANEL There are nine reporters who make up this panel (as of September 30 , 2005 ), according Nielsen Broadcast Data Systems :
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