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In
this example, we want to bring the inclined horizon back into balance.
Select the Measure Tool on the Tools palette (or press I).
By default, the Eyedropper Tool is selected, but after holding
the left mouse button pressed for a second or two, a list appears
that also contains the Measure Tool.
Click
with the Measure tool on one end of the horizon, and drag
the pointer to the other end, then release the mouse button. The
measuring line must follow the skewness of the horizon.

Click Image/Rotate Canvas/Arbitrary in the menu. The rotation
angle will be the inclination of the measuring line, In our case,
1.86 degrees.

Click
OK to rotate the picture.
The
rotation leaves strips of the background color at the edges of the
picture. We need to remove them. Select the Crop Tool (press
C), and drag a rectangular marquee inside the picture. You
needn't be very precise as you can set the exact size and position
by dragging the corner points. After you're done with the sizing,
press Enter to activate the Crop Tool and get rid of the
unwanted side strips.

The
final result:

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