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Correlation function in 2 Dimensions

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Subject	Correlation function in 2 Dimensions
From	aris amvrosiadis <aramvros@gmail.com>
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 Hello, I have the following data.dat file arranged like:

   X_1   Y_1   Z_1
   X_1   Y_2   Z_2
    .     .     .
    .     .     .
   X_1   Y_n   Z_n
   X_2   Y_1   Z_{n+1}
    .     .     .
    .     .     .
   X_2   Y_n   Z_{2*,}
    .     .     .
    .     .     .
   X_n   Y_n   Z_{n*n}

So i have created a 2D grid, which if we imagine it as squares, each square has a value Z_i ( where z=(0,2) ). Now i want to create a 2D graph {x,y}  like the one found in (http://arxiv.org/pdf/astro-ph/0103143v1.pdf) figure 2.

Since i have x=(0,11) , y=(0,11) i need to create the graph in one quadrant and then duplicate it. 

Can anyone provide me with the code to create the graph in one quadrant, in other words if you imagine a grid of squares in 2D, i need each square to have a different colour depending on the value on the Z that each square has.

Hope i haven't confuse you.

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Correlation function in 2 Dimensions aris amvrosiadis <aramvros@gmail.com> - 2015-01-18 05:13 -0800
  Re: Correlation function in 2 Dimensions Karl <mail.kfr@gmx.net> - 2015-01-18 20:27 +0100

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