You can align an image with respect to any one of the three unit-call axes, let it be horizontal, vertical or at any angle with the horizontal axis. Start from the left window. Pull down the 'View' menu and select 'Ajust Axis'. A dialog box will appear. Select the a axis and put '30' into the data box preceding the word degrees. Then by clicking 'OK' you will get an image as shown in the right window. Actually this image will not appear in a new window but just replace the original image in the left window. If you wish to keep the result, You would save it manually before attempting to close the window.