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Plot Options: Lines and Colours
This window allows you to select the colours of the lines displayed, and their
thicknesses. You can generally decide whether or not to show a particular line.
However, for some plots of graphs, this is not an option, and the check boxes
will be ghosted.

To change colours, click on the appropriate button. The standard Windows colour requestor will appear.
You can also change the colour of the markers and of the background. The 'Markers...' button is identical in function to the corresponding button on the 'Markers' tab, and is duplicated here for your convenience.
The 'Font...' button lets you choose the font for the labels on the axes.
When setting the properties for a group of plots drawn together, some of the options on this window are not relevant and will be ghosted.
