Squares tend to make smaller changes look more significant than they look on rectangles; or if you prefer, rectangles tend to minimize changes in blood sugar traces compared to squares. Either way, you’ll get used to whatever you live with.
That said, which format you have will affect which graphs you’ll find most useful. A square 3-hour display is pretty handy. A rectangular 3-hour display will always look flat unless the shit has really hit the fan. At the same time, a six hour graph on a rectangle is pretty sweet while changes in six-hour blood sugar on a square screen look more severe than they are.
Find out more about this book:Beyond Fingersticks: The art of control with continuous glucose monitoring