That's a great rainbow shot.I had a little bit of luck a few minutes ago.
<img src="http://www.ipadforums.net/attachment.php?attachmentid=42488"/>
Better visible here:
<img src="http://www.ipadforums.net/attachment.php?attachmentid=42489"/>
<img src="http://www.ipadforums.net/attachment.php?attachmentid=42490"/>
If I can ever find it, I've got a photo of a triple rainbow hiding someplace, I took it back in the 1970’s.