Question: what is the number of the episode in the season that had 5.60 millions of north american spectors?
SQL: SELECT "No." FROM "1-2866509-1" WHERE "U.S. viewers (million)" = '5.60';

Question: who are the writers of the episode whose production code is 176206? 
SQL: SELECT "Written by" FROM "1-2866509-1" WHERE "Production code" = 176206.0;