The individual zigs and zags used tocontrol column angle can be seen in the first 200 nm ofgrowth of the film shown in Fig. 7~b!, before heating fromthe evaporation process has heated the film and substrate andincreased the adatom mobility. In Fig. 7~c! the spin versuspause technique was used. The relative proportion of growthwhile the substrate was spinning ~spinning growth! was varied relative to the growth while the substrate was stationary~paused growth!. As the minor pitch was set at 20 nm, thestructural building blocks ~spinning growth and pausedgrowth! were much smaller than those with the zigzag technique and the stepwise growth cannot be seen even at theearly stages of growth.
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