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* "Estimated circulation" for Tribune Co. dailies reported in a chart in the Newspaper Special Report (April 18, P. S-4) is based on weekday circulation reported to the Audit Bureau of Circulations. In cases where newspapers did not report Monday-Friday or Monday-Saturday circulation, the estimates were based on other weekday periods. The estimates for the South Florida Sun-Sentinel and The Morning Call were based on their Monday-Wednesday circulation (218,781 and 111,956, respectively); their actual later-week circulation is higher (250,782 and 126,470 on Thursday-Saturday, respectively).

* In the Viewpoint piece "The :30 is on its last legs; now's the time to rewire the TV ad industry," (April 11, P. 46) the survey of 55 advertisers cited at the end of the piece was conducted jointly by the Association of National Advertisers and Forrester Research.

* In "FDA Ruling Threatens DTC Dollars," (AA, April 11) it was stated that Purdue Pharmaceuticals' Palladone was approved by the FDA with the stipulation that it could not be marketed to consumers for six months. However, Purdue never intended to use DTC advertising for Palladone and in the first 18 months following the launch is marketing the product only to a limited number of medical practitioners.

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