Letter Attributes.

The height and width of each letter is specified as dot count and as degrees of visual angle. The latter was measured from the outer edges of the most extreme dots. Mean width of letters was 17.3 dots (2.60 arc°). Mean number of dots in the letter patterns was 153.6.Letter Attributes.每个字母的高度与宽度均以点阵数（dot count）与视角度数（degrees of visual angle）两种单位进行标定。其中后者（即视角度数）的测量基准为最外侧点阵的外边缘。字母的平均宽度为17.3个点阵（2.60 arc°）。字母点阵图案的平均点阵数为153.6。字母属性。