How many different original airs date do episode series number 13 have?
Series No. Season No. Title Directed by Written by Original air date U.K. viewers (million)
real real text text text text text
1-19236587-4
13 1 "The Fashion Show" Ben Palmer Damon Beesley & Iain Morris 13September2010 2.25
14 2 " The Gig and the Girlfriend " Ben Palmer Damon Beesley & Iain Morris 20September2010 2.13
15 3 "Will's Dilemma" Ben Palmer Damon Beesley & Iain Morris 27September2010 2.28
16 4 "The Trip to Warwick" Ben Palmer Damon Beesley & Iain Morris 4October2010 2.17
17 5 "Home Alone" Ben Palmer Damon Beesley & Iain Morris 11October2010 2.43
table_19236587_4
SELECT COUNT Original air date FROM table WHERE Series No. = 13
13