how to change the plot background?

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I want to show the background of the plot above like the plot below.
This is the code for each.

Answers (1)

Constantino Carlos Reyes-Aldasoro
Most probably the first figure you are showing is and RGB (type "whos" and look for the dimensions it should be rows x columns x 3) and that is why it is not appearing with the colour map. The second image is just intensity based (rows x columns). If you check that then we can follow and display as you want.

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