Question: Name the broadcast date for 6.4 million viewers for the archive of 16mm t/r
Schema: create table table_1776943_1 (broadcast_date varchar, viewers__in_millions_ varchar, archive varchar, PRIMARY KEY (broadcast_date))
SQL: select broadcast_date from table_1776943_1 where viewers__in_millions_ = "6.4" and archive = "16mm t/r"