user: Question: What was the official ITV1 HD rating in millions for the episode that had an official ITV1 rating of 8.98 million?
Columns: ['Episode', 'Date', 'Official ITV1 rating (millions)', 'Weekly rank', 'Share (%)', 'Official ITV1 HD rating (millions)', 'Total ITV1 viewers (millions)']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Auditions 1', '16 April', '9.74', 3.0, '40.5', '1.110', '10.850']
SQL:

assistant: SELECT "Official ITV1 HD rating (millions)" FROM "Table" WHERE "Official ITV1 rating (millions)" = '8.98';