CREATE TABLE table_983 ("Competition" TEXT, "Record" TEXT, "Result" TEXT, "Home Matches" FLOAT, "Home Attendance" FLOAT, "Avg. Home Attendance" FLOAT)

What was the lowest home attendance for the southern derby?
SELECT MIN("Home Attendance") FROM table_983 WHERE "Competition" = 'Southern Derby'
SELECT MIN("Home Attendance") FROM "table_983" WHERE "Competition" = 'Southern Derby'