map from a data file

[Maso Ricci]

Hi all,

I have a question: I have some data having the following structure

1   1  <value>
1   2  <value>
1   3  <value>
2   1  <value>
2   2  <value>
2   3  <value>
3   1  <value>
.
.
.
.

well I would like to plot them like a map using the first two columns as 
  X and Y respectively and the third one as Z value.
Of course it would be great if the Z value could determines the colour 
of the point in the map

thanks for the hints


-- 

Maso Ricci Ph.D
Dept. of Chemical and Biosystem Science
University of Siena
Via A. Moro, 2 ­ 53100 Siena
ITALY
Tel: +39 0577 234367
Fax: +39 0577 234177
email: ricci2 at unisi.it