Here's a "uniform" table

I like uniform tables
Column Header 1Column Header 2Column Header 3Column Header 4
Row Header 1data cell 1data cell 2data cell 3data cell 4
Row Header 2data cell 5data cell 6data cell 7data cell 8
Row Header 3data cell 9data cell 10data cell 11data cell 12

Here's one with some colspans

Sample Data
Column Header 1Column Header 2 through 4
Row Header 1data cell 1data cell 2data cell 3data cell 4
Row Header 2data cell 5data cell 6data cells 7 and 8
Row Header 3data cells 9 and 10data cell 11data cell 12

Here's one with some rowspans

Column Header 1Column Header 2Column Header 3Column Header 4
Row Header 1 and 2data cell 1data cells 2, 6, and 10data cell 3data cell 4
data cell 5data cell 7data cell 8
Row Header 3data cell 9data cell 11data cell 12