How to create a special 2D contour plot?

[sdkdgg]

Hi,

Who has any clue to create the following type of 2D contour chart? I mean one of them. Please note that the upper left and lower right corner are left out or cut away, i.e., if it is a matrix, some cells are empty. Any clue is appreciated!!!

01 02 03 04 05
01 xx xx xx xx
02 xx xx xx xx xx
03 xx xx xx xx
04 xx xx xx
05 xx xx

 

[p45cal]

two ways:
<embed src="https://www.box.net/embed/9i2g2ol8so01lbg.swf" wmode="opaque" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" height="400" width="466">

top right is a surface contour map
bottom left is conditional formatting
xl2010