The horizontal alignment requirements of this format (type CFNumber). For example,the alignment for v210 would be 8 here for the horizontal case to match the standard v210 row alignment value of 48. Assumed to be 1 if this key is not present.
Available in Mac OS X v10.4 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)