Choosing one of the preset margin width alternatives in this drop-down menu ensures consistency ... and dragging the margin markers on the ruler. Just make sure you don't leave the margins too ...

Specifically, their data set consisted of images where a pathologist had put in a ruler to measure the size of malignant ...

They use the ruler-drop test to measure how fast they react, and see how distractions such as doing a sum or remembering a series of letters effects their timings. The more they practice ...

A suitable investigation could be the effect of caffeine or the amount of background noise in the room. A simple method to measure the effect is to use the ruler drop test.