user: Question: How many were the viewers (in millions) of the series no. 45?
Columns: ['Episode No.', 'Series No.', 'Episode', 'Director', 'Writer(s)', 'Original airdate', 'Viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [734.0, 1.0, '"Entry Wounds"', 'Paul Murphy', 'Mark Catley', '4September2010', '5.97']
SQL:

assistant: SELECT "Viewers (millions)" FROM "Table" WHERE "Series No." = 45.0;