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Dear Shelby,

1)  To select an image ( that contains a graph ) you can double-click on the right side close to of its field.

     Once it is selected, the rectangular field appears lightly in grey.

     Then you can copy it ( cmd c ) or cut it (cmd x ).

2) To change the color of the curve, or its line-style, or its color filling,  its opacity …  use the command Set Properties from the menu ( first pict ) and then select the curve and the surface you want to modify. 

     For the change from fig.1 to fig.2 I colored and white ( with opacity 100% ) the surface under the horizontal. Then change whatever you want (second pict )

     For the change from fig.2 to fig.3 I changed the unit ( something like 1.5cm in place of 1cm ) and I introduced a cartesian grid.

Have a nice week-end,

Bertrand