If you google: NATOPS flight hangar deck manual
Your first hit should be a pdf of the December, 2010 edition of the manual in pdf form.
Download/open that, and scroll down to Page 2-11, which will be an illustration of a T-45 aircraft tied down, and showing the arrangement and spacing of the tie downs. "10 Feet (typical)" vertical and horizontal spacing is shown, but the diagonal distance is more complicated because of the way the rows are staggered. "A picture is worth a thousand words" therefore, so I urge you to get hold of the NATOPS flight/hangar deck pdf