content: Going with the pic quadcem posted, width of one of the flact structures is 200 µm, that's 200 millionths of a metre = 200 thousandths of a millimetre, ie. 1/5 of a millimetre.. The scale is about 5cm on my screen, let's say 2 inches. 200 µm goes 5000 times to a metre, so one metre would look like 5000 metres - five kilometres in that scale = 3.1 miles.