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argument list for ArrowBox?

I'm using Mathematica 7.0.1 on a Mac (OS X) to prepare an exam for a
basic physics lab.  This often calls for a Graphics cell to depict
some configuration.  Since this cell is invariably created square, and
there seems to be no easy way to change the box's aspect ratio within
Mathematica, I open a text editor and edit the exam's .nb file
directly, modifying the options of ImageSize.

This is awkward, but works.  In the process I ran into the function
ArrowBox, whose options I'd like to modify to eliminate an invisible
mask that's cropping the arrowhead.

But I've been unable to find anywhere a description of ArrowBox's
arguments.  The instruction Options[ArrowBox] produces an empty pair
of curly brackets.  All I've gathered  so far is that the arguments
consist of a two-component list of two-component lists of numbers.

How do I find that sort of information?  Thanks.

- Dushan Mitrovich

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