Headers + id on spanned headers

See also:

Table with headers designated by headers + id

Test results for tables 1 and 2 are listed in a separate results page.

Row Group Headers

Example 1 (row group headers):
empty 1 mile 5 km 10 km
Females Mary 8:32 28:04 1:01:16
Betsy 7:43 26:47 55:38
Males Matt 7:55 27:29 57:04
Todd 7:01 24:21 50:35

Column Group Headers

Example 2 (column group headers):
empty Females Males
Mary Betsy Matt Todd
1 mile 8:32 7:43 7:55 7:01
5 km 28:04 26:47 27:29 24:21
10 km 1:01:16 55:38 57:04 50:35