Hund's Rule Spin: +1 vs -1 | Wiki Explanation

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http://en.wikipedia.org/wiki/Image:Si_Hund.png

can someone help clarify something for me
in this diagram why is it that the arrow is placed in +1 first and in my textbook it is placed in -1 first?
 
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Does it really matter? As long as there is no external magnetic field these orbitals are degenerated, so they can be occupied in any order.