user: Question: What is the total number of TD's of the gavin storm with a total STC's smaller than 6?
Columns: ['Season', "Total TD's", "Total TC's", "Total STC's", 'Strongest storm']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['1990–91', 5.0, 3.0, 1.0, 'Sina']
SQL:

assistant: SELECT SUM("Total TD's") FROM "Table" WHERE "Strongest storm" = 'gavin' AND "Total STC's" < 6.0;