question about the AF data format

hi all,

I have a question about the AF data format. in the sum mode, which one is it ?

struct af_stat_data
{
	struct
	{
		uint32 sum   ; 
		uint32 HFV_1 ; 
		uint32 HFV_2 ; 
		uint32 ZERO ; 
	} sum[3] ; // R Gr+Gb B ?
} ;

or 

struct af_stat_data
{
	struct
	{
		uint16 sum   ; uint16 unkown_0 ;
		uint16 HFV_1 ; uint16 unkown_1 ;
		uint16 HFV_2 ; uint16 unkown_2 ;
		uint16 ZERO  ; uint16 unkown_3 ;
	} sum[3] ; // R Gr+Gb B ?
} ;

According to the real data, it seems the first format is right. 
but according the document, the second is the answer.
I am confused.

Another question is about the sum, is it sum( R | Gr | Gb | B )  ?