enum ITEMTYPE {
	ITEMTYPE_BYTE,
	ITEMTYPE_WORD,
	ITEMTYPE_DWORD,
	ITEMTYPE_FLOAT,
	ITEMTYPE_DOUBLE
};

static DWORD g_itemLen[] = {sizeof(BYTE), sizeof(WORD), sizeof(DWORD), sizeof(FLOAT), sizeof(DOUBLE)};

enum DATATYPE {
	DATATYPE_EOP = 0,
	DATATYPE_XVALUES,
	DATATYPE_YVALUES,
	DATATYPE_XLABEL,
	DATATYPE_YLABEL,
	DATATYPE_LEGEND,
	DATATYPE_COLOR,
	DATATYPE_MARK,
	DATATYPE_GRAPHNAME, 
	DATATYPE_XRANGE,
	DATATYPE_YRANGE
};

typedef struct {
	char type[4];	// must be	"plot" for plot data
					// or		"glbl" for global data // NOT YET INPLEMENTED
}PLOTFILEHEADER, *LPPLOTFILEHEADER;

typedef struct {
	DATATYPE dataType;
	ITEMTYPE itemType;
	DWORD dwDataLen;
}PLOTHEADER, *LPPLOTHEADER;