user: Question: What is the Digital PSIP for channels over 15 with callsign CFTU-DT?
Columns: ['Call sign', 'Broadcast channel', 'Digital PSIP', 'Cable channel', 'Network']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['CBFT-DT', 19.0, 2.1, 4.0, 'Ici Radio-Canada']
SQL:

assistant: SELECT "Digital PSIP" FROM "Table" WHERE "Broadcast channel" > 15.0 AND "Call sign" = 'CFTU-DT';