F7-9 (F7b9) altered chord

Altered F chord for piano presented by keyboard diagrams.
Explanation: The F7-9 alter the F9 by the change of one note. The chord name can also be written as F7b9 or F7(b9).
Theory: The F7-9 are identical with the F9 except that the major ninth is flattenedThe tone is one half step lower.