The image file is input.tif in the current folder. It is a scanning electron microscope image of a laser-structured surface; the instrument's information bar at the bottom of the image shows the magnification and a scale bar.

Measure the dominant spatial period of the surface structures in nanometres and state their orientation in the image. Say which scale (nm per pixel, or magnification and scale bar) you used.

End your answer with one line exactly in this form: RESULT: period = <value> nm
