Grace notes, ties, optimum notation

[Steve D]

I have recently begun to learn LilyPond, which is an exceptionally nice 
program, though I have a tremendous amount to learn about it.

I would like to ask if anyone might have a suggestion how better to 
notate the last measure of the piano piece linked to below (it is a 
screen capture of LilyPond's PDF output of the piece). The last chord of 
the piece is arpeggiated, but not in exact sequence of notes from bottom 
to top: one note (the F second to top) is out of order.

Link to .png image of .pdf output of lilypond:

http://www.xscd.com/pics/lilypond-example.PNG

Thank you, and best wishes,

Steve D, New Mexico US

P.S. Should I have attached the .png image instead, for the sake of the 
archives?