By default, graphs are created in a very basic form: the series have no title, a default color and thickness (maybe not the one ones you prefer) is used for all of them, the axes have no title either, no legend is shown, etc.
We will now modify the layout and style of the chart to make it easier to read and more appealing (for example to use it in a report). First of all, add a title to the series corresponding to the results of the model with the initial settings. In all the following code, feel free to use the styling options (e.g. colors) you like the most.
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