What is varricchio's unit?
CREATE TABLE table_6913 (
    "Name" text,
    "Novelty" text,
    "Status" text,
    "Authors" text,
    "Unit" text,
    "Location" text
)
SELECT "Unit" FROM table_6913 WHERE "Authors" = 'varricchio'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is varricchio's unit? ### Input: CREATE TABLE table_6913 (
    "Name" text,
    "Novelty" text,
    "Status" text,
    "Authors" text,
    "Unit" text,
    "Location" text
) ### Response: SELECT "Unit" FROM table_6913 WHERE "Authors" = 'varricchio'