Identify thresholds with colours in contourf

Hi, my problem is:
I've got a square matrix with number from -1k to +50k, I would like to print these with contourf identifying two thresholds with colours. For example if the cell(i,j) is less than X, I would like to see red colour instead if the cell(i,j) is greater than X, I would like to see green colour, in the middle orange. How can I do this?

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M C
on 20 Jan 2018

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