1
line-spacing in text;between the lines
See also:
行間を読む (ぎょうかんをよむ)
文字を大きくし、文字間や行間に余裕をもたせ、高齢者の方や、視力に障害のある方が読み易いように注意しました。
I took care to make the letters large and be generous with character and line spacing in order for it to be easy to read for the elderly and those who have problems with their sight.