user: Question: What is the Parts-per example of 2×10 −6?
Columns: ['Coefficient', 'Parts-per example', 'Uno equiv.', 'Symbol form', 'Value of quantity']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['10 −2', '2%', '2 centiuno', '2 cU', '2×10 −2']
SQL:

assistant: SELECT "Parts-per example" FROM "Table" WHERE "Value of quantity" = '2×10 −6';