That looks fine, I assume it's all one line in the text editor? I wonder if frequency should be 1? We don't use files all that often (VOF to DPM is the exception) and I can't remember what it's exact purpose is.
(z=4 12)
( x y z u v w diameter t mass-flow mass frequency time name)
(1 2 3 1 2 3 1e-5 300 0.001 0.1 1 0.001 injection:99)