Plotting three variables in a 2D coloured plot

I have 3 column data file, where x is Frecuency, y is Azimuth and z is Spectrum Amplitude.

I want to plot the values in a coloured plot where every pair of data (Frecuency, Azimuth) has an Amplitude value related to a colour.

The result should be as in the image.

Is it a cotour plot? Image plot?

Thank you very much in advance.

[Bob Thompson]

Do you know about contour, contourf, and mesh?

[KSSV]

It depends on how you datar is.....you have a column matrix data? Or the data is already in matrix form?