|3 Add a new layer (Layers>New Raster Layer). The new layer should sit on top of Top Layer (this will be a dummy layer). Draw a white line in the area where you wanted to expose the wires.
Type = Single Line
Style = Stroked
Width = 30
Antialias = checked
|Choose Round Cap End Under the Draw Options Tab
Pick the Selection Tool , press [CTRL+A] and cliick your mouse anywhere on your image. The white line should become the active selection. Save this selection to alpha channel (Selections>Save to Alpha Channel) and name it "Exposed area". Deselect active selection by pressing [CTRL+D]. Delete Layer3 (Layers>Delete).
Load "Exposed area" selection (Selections>Load from Alpha Channel). Apply a Linear gradient fill using the same settings in Step 2 on this time, set Angle = 0.