scope test

col head	row head	col head
col head	data	row head
row head	data	col head

row header and column header (1)

data	row head	row head
row head	row head	data
row head	data	row head

row header and column header (2)

row head	data	data
column head	column head	column head
data	data	data

row header and column header (3)

	col head
	col head	col head
row head	data	data

row header and column header (4)

row head	col head
	row head