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It's one of the thousands of features of Mathematica. Look up `ColorData`, `ColorSchemes` in the documentation. There is also a `ColorSchemes` palette.
Look up the documentation of **Show**. You can also NOT use **Graphics** inside the **Table**, and then use **Graphics** on the entire result of the **Table**.
You are welcome. Perhaps you will find the following modification of the code more handsome (see Notebook). First I define the function to be displayed, then the constant items and then comes the plot. Regards, Hans